This is one of those spambots that post like barely-intelligent humans (and sometimes actually surprisingly post on-topic), but has a signature that's set to something like what's on here. Reason being, most forums have signatures, so the links actually get shown.
Also, they usually come in groups with completely different IP addresses every time. I'd know this 'cuz I've banned them off of a forum I go to that I'm a moderator at.