Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a29c2381336480d…

MALICIOUS

PDF

56.6 KB Created: 2021-06-21 08:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b0b92fe600610b8566c3bdfd7f58ce81 SHA-1: ce7c0844bc8e4db13d51cae041071626d68f497e SHA-256: 5a29c2381336480da81332ad503f4f71a9644d69207dc32f924711316ae0be31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage compromised infrastructure for hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b083057e6a6---sepirutapemubepefo.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/32e21018e63644e480d7a5b13ad5a232/gilanurozabasojewibu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/sibuzowapovadivedufar.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9b99c3d5c5877b0b2bb886b7f7cf2cd9/84099617628.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5280fdfb65ad2b418130894c0af4fa8b/dagimuxojuvomuti.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gg6j9sgr6502rtkfgcv7pbqr01/21456935934.pdfIn PDF document text
    • https://ckmandarin.com/uploads/83144306515.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/09hc0m2sg0krp46lblbm9l6vb5/kerozanoxododigefif.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nenezakewaximesajodofinab.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0956f1731---93656352121.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/ruwozunafimimepawogokub.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075132ace6d6---85735285808.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f6d95c8e43145d83185f93e488a32f9c/92790478979.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0afcf76e---jasowafobow.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607721a42bebe---7352678463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=roman+word+1+to+100PDF link annotation

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