Parked domains, which act as aliases and redirect to other websites, can send visitors to malicious or unwanted landing pages or turn entirely malicious at any point in time. Palo Alto Networks found that 27,000 newly identified newly parked domains are out on the web on average daily. In the past six months, the firm has identified 5 million newly-identified parked domains in six months; 31 percent were changed to being deemed suspicious or not-safe after being classified as benign.
Source: https://threatpost.com/xfinity-mcafee-brands-abused-parked-domains/160698/