Just one way a scraper site can fool the search engines in believing they are linking to you (it is said you get better ranked when linking to on-topic sites).
Copy the below web page as anyname.html on your desktop and open it.
As you will notice, when you view the page it's not exactly what's in the source code.
<HTML><HEAD>
<script>window.status=' ';</script><title>Rivertree web design</title></HEAD><FRAMESET border=0 rows="100%,*" frameborder="no" marginleft=0 margintop=0 marginright=0 marginbottom=0>
<frame src="http://www.river-tree.net" scrolling=auto frameborder="no" border=0 noresize><frame topmargin="0" marginwidth=0 scrolling=no marginheight=0 frameborder="no" border=0 noresize>
<body>
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
RIVER TREE WEB DESIGN - River Tree Web
Design is dedicated to the backbone of America's commerce, the entrepreneur.
</body></FRAMESET></HTML>
This is one of many black-hat optimization techniques used.
No harm no fowl. I have well over a thousand of these scraper sites linking to me in this fashion and my rankings are still stable. Nothing to worry about.