My guess is your machine was compromised before clicking on a 13-G filing, or possibly during depending on the website you were on.
Consider your machine compromised, at the least. Try to pull down a virus scanner, malware scanner and see if it will find anything. You may also have recent browser extensions that could have been compromised.
Consider your machine compromised, at the least. Try to pull down a virus scanner, malware scanner and see if it will find anything. You may also have recent browser extensions that could have been compromised.