When wordfence emails about problems found, it should give more information.
e.g. instead of saying:
File contains suspected malware URL: /home/user/blogroot/wp-content/cache/page_enhanced/domainname.net/category/software/_index.html.old
It should say something like:
File contains suspected malware URL [http://bad.host.com/path/path2] in /home/user/blogroot/wp-content/cache/page_enhanced/domainname.net/category/software/_index.html.old
That would make it easier to debug the issue and delete the URLs that the page is referring to.
--Amit