Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e460b889938cebc…

MALICIOUS

PDF

51.4 KB Created: 2021-09-04 01:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c68724d48391fd4ee9d17f7ee185645 SHA-1: 556990eb8b620820e4d2b51a1914d1b6418ae6be SHA-256: 5e460b889938cebc8447aa2f28242516b55c483b8fe1f3594a9b70a60fc1dfc3
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs likely serve as lures to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7261

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 http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25fa20f20---13319434084.pdf In PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/jgdr48anl1mqbt310lrk0lvf1r/52404964742.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gafazadoxip.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/virabu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128849f3f62a---94368043236.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/ranuk.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/zinaxoxanojejumos.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/15445052087.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210814020804.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/161095d1640216---17731043003.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/36409291096.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc18e01284---joselixepiruseki.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bea40a4c4ea---sowozijogane.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fq2ftupsea2lokdf6e0mv9sutt/10069677776.pdfIn PDF document text
    • http://suitianhose.com/uploadfile/files/55797997108.pdfIn PDF document text
    • http://change4best.ru/upload/file/27733720453.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/vl8ah6rbhrbh2rn5j3vnpgq6om/79826830637.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b7108d57dbd---gokutolirasufobav.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/sogevul.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/20837842976.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/29985801080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=simple+and+compound+predicate+worksheetsPDF link annotation

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