Forgive me if this is in the wrong area - I thought considering the topic, it belonged here (as opposed to in WP). Correct me or move it if I am wrong.
I've been looking around one of the sites I control (one we've been having all kinds of little problems with) and checked my 404 logs. Usually I expect to see the generated captcha images and other random entries, but today I saw several of the site's pages on there with "/(" appended at the end, all with "PHPCrawl" as the User Agent.
As far as I can figure, this is an open source script available for developers to use at their discretion. I've not used anything of the sort. I don't believe anyone else in control of the site has.
Is it possible one of the plugins could have caused these entries? Is it automated from some search engine? Is it something I should be worried about hurting the site or its SEO?