My Iphone keeps downloading apps by itself?

My phone keeps on downloading random apps for no apparent reason. I looked online and people were saying how it was itunes sync which sounded ok because my sister uses the account but then l I started getting apps like "poo head" and "sh*t". Furthermore they're just stuck on waiting and they wouldn't delete until I turned off my phone and stuff.

Does this sound like a virus or something? I know it's probably and hopefully not from what I've been reading but I'm just very confused

Added (1). I forgot to add that I also checked my purchased apps and they're nowhere to be found which is also why I don't believe it's my sister.

Omg that happened to my iPod touch 5 (with ios7.4) but it just updated to a holiday thingy by itself. Its ok.

First you should check if someone else uses itunes in your household and possibly done something to result in this. From what I've read I would assume it's a virus, I would restore the iphone and reset everything and see if the problem still persists.

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