As a more general / effective temporary fix, CD could have a whitelist for websites that actually will generate links. Eg, FIRST website, TBA, Github, etc would be allowed as links, while other links would simply display URLs without actually being a link.
Example:
link to github (whitelisted, displayed as link)
http://genglobal.org/some-spam (not whitelisted, displayed as plain url)
On other forums this type of system is effective at preventing spam from new users (in fairness, other forums have other measures as well), since spammers know people aren't going to copy and paste their spam. I'm not sure how effective it'll be on our resident spammer here, but I think it's worth a try.