Phishers are trying to trick LinkedIn users into opening a ‘LinkedIn Private Shared Document’ and entering their login credentials into a fake LinkedIn login page. The phishing message is delivered via LinkedIn’s internal messaging system and looks like it has been sent by one of the victim’s contacts. The message urges the recipient to follow a third-party link to view a document. If they fail to find this suspicious, they’ll be redirected to a convincingly spoofed login page, and their account will probably soon be sending out phishing messages to their contacts.
Source: https://www.helpnetsecurity.com/2021/02/18/linkedin-private-shared-document/