01d74549_ikipedia_Vandalism___Wikipedia__Type
[Description] Vandalism that is harder to spot, or that otherwise circumvents detection, including adding plausible misinformation to articles (such as minor alteration of facts or additions of plausible-sounding hoaxes), hiding vandalism (such as by making two bad edits and only reverting one), simultaneously using multiple accounts or IP addresses to vandalize, abuse of maintenance and deletion templates, or reverting legitimate edits with the intent of hindering the improvement of pages. Some vandals even follow their vandalism with an edit that states "rv vandalism" in the edit summary in order to give the appearance the vandalism was reverted. [Type] 
Sneaky vandalism
Wikipedia:Vandalism - Wikipedia
Type