Actually your site looks clean to me. Those Sucuri results are actually NOT CORRECT. This is a False Positive from Sucuri.net as you can see from their “View Payload” link:
Hyatt Hotels Payment System Hacked By Credit-Card Stealing Malware
It looks to me like you wrote an article on your site that mentions this “Hotel Hack” and Sucuri has misinterpreted the words “Hacked By Credit-Card…” as a defacement when it’s really not 
