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Yo can easily use a "lead is created" trigger with "source type = SFDC" constraint to identify these leads when they are created in Marketo from SFDc and trigger some smart campaign that will categorize the leads, for instance.
Another, recommended tactics is to use sales insight here: create a few emails / smart campaigns that you make available to the sales and propose them to add these new SFDC contacts to these smart campaigns or to send these emails. The campaigns and/or emails will include links to dedicate content, some of them with forms. monitor lead reactions to these content pieces and include reactive leads in you smart campaigns.