Maybe second only to ransomware, the most likely type of attack a shipping operator will experience will be a phishing scam. Usually this will be carried out by email, or social media, or even messaging apps. It will likely include a link to what seems a plausible website, and/or have an attachment.

https://www.pentestpartners.com/security-blog/shipping-operators-what-you-need-to-know-about-phishing-and-ceo-fraud/