This plugin inserts hidden links to:
You will not be able to see the link from the computer you log into wordpress from. I found the link in google cache.
Once you install the plugin, you can see the code for the link to the spam site.
Here is the screen shot of the plugin code:
These links were appearing on my wordpress blog: http://pakglow.com. I never saw the links on my site, until I checked google cache for my indexed pages. If you check the google cache you can still see the links on some of my pages.