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Moreover , as users collaborate and share through cloud services , these malicious files posing as PDFs “ fan out ” to shared users , creating a secondary propagation vector .
 ( phishing: posing as,  these malicious files: tool, creating a secondary propagation vector: attack pattern, users: victim, shared users: victim, PDFs: trusted entity, share through cloud services: attack pattern) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( phishing: posing as,  these malicious files: tool, creating a secondary propagation vector: attack pattern, users: victim, shared users: victim, PDFs: trusted entity, share through cloud services: attack pattern) 