Just come it to my mind. is it possible? to get hook into your wallet and send some to another wallet? 
Yes it's possible.
Let's take an example about web wallets, some shitpeople makes phishing site and it's really present in some of the banners and ads today in some of the famous sites. It's actively seen too in some of the PTC ads today.
So if you really want to have your coins really secure, take it away from the crypto world if you know what I mean.