Spambot

From eg

A spambot is a bot that spreads spam liberally as mailing list posts, blog commentss, and wiki pages.

There are four levels of wiki spam from least to most obnoxious:

1. to spam only open links may not be noticed nor seem malevolent until other spambots detect the spam and add more
2. to add spam to pages, often invisibly, while leaving the useful content on the page
3. to replace all page content with spam which is wiki vandalism by any definition, and justification for anti-spam attacks and black hat response against attackers.