Single URL vector Attack ?

I am seeing a new hybrid type of comment's spam in the making here.   One of my posts is being targetted periodically every 3 hrs. Each post comes is originating from a different IP.

• IP Address: 69.31.46.204
• IP Address: 59.171.132.228
• IP Address: 221.148.132.245

Included here is a screen scape from my Admin toolbox.  I will delete the comments for the time being.  I will edit the target post and disable comments.

I am not sure, where the root of the bootnet, but I will like to see if someone , somehere will manually tweak the attack table to identify another open vector on my blog or is the botnet intelligent enough to figure that one out !!

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