Selected answers from the Dumb SEO Questions Facebook & G+ community.
E Dieter Martin: It could just be a WordPress site with a Blogroll on every page. Check what`s going on there.
10h
Muhammad Umar: E Dieter Martin webworthchecker, comThis site is doing it.
4h
Michael Martinez: Disavowing is only necessary when you`ve paid for the links.
9h
Sal Isme: What do the links look like? Disavowing doesn’t remove backlinks, it communicates to Google that you did not intend to gain these backlinks.