Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f88b79d4a38c53…

MALICIOUS

PDF

39.9 KB Created: 2021-07-22 06:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95afb636703beb9daca3ca50919d98e1 SHA-1: 6c5d363ce75ace6faef829bfbf315579355c30f0 SHA-256: 20f88b79d4a38c535d5d66caed857005865309adece4417efbb1702a9714080b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious phishing trojan by ClamAV and ML classifiers. Heuristics indicate it's an image-only lure designed to trick users into clicking embedded links. Multiple URLs point to compromised CMS upload directories, suggesting a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8821

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087315dcf0ed---jigatekukebuv.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mhdg0iir9e66lebrf34haltchv/xemoginapewenunebonajine.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/podupurubifemukojunikiveg.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/jegusudanamogizapiz.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72da1378ce---20079115907.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/zajugob.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/32453176514.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1ad9ef215c2068e670f817d2f7575498/menapazibo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c4171393506---labavibakaxovitusevobex.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/tv97ift86b9sdji7jffhgq31u2/senazukajifijasosudiw.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa7472331---67827110237.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6cd6331b---53183307625.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/83043343960.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446279c587---nogududopefifibunib.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892ad5eec57---27154640036.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5d45035f7d80056499126285f3578512/naxujiboxiwesujemifuva.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/79409946298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+convert+pdf+file+into+ms+excelPDF link annotation

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