When you connect HubSpot with your PhantomBuster account, PhantomBuster will automatically create several custom properties to log data.
These properties give you context about your campaigns, details and history about your contacts and companies.
Where to find default properties created by PhantomBuster in HubSpot
In HubSpot, go to your Settings → Properties → Contact properties. The properties automatically created by PhantomBuster are stored in a group called PhantomBuster.