My filter has been catching spam comments promoting seoplugins dot org (I don’t want WordPress turning that into a link). A web search discloses that their spam has slipped past the filters at quite a number of sites.
Software promoted by spam comments is almost never legitimate and is often malicious. SEO is “search engine optimization” and is a favorite field for unsavory characters preying on site owners’ desperation for more hits. I suggest giving these people a wide berth.