According to Wikipedia, MikePence.com was his official campaign website and other than that there is only his page on the whitehouse web page and on Indiana's s

According to Wikipedia, MikePence.com was his official campaign website and other than that there is only his page on the whitehouse web page and on Indiana's state government ("former governor"). So I don't think this is a hack, this is just someone registering an official looking domain name and putting a spoof website on there. (It is also registered with GoDaddy's private WHOIS registration.)