Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b155ff3e1249a4…

MALICIOUS

PDF

47.9 KB Created: 2021-07-08 08:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 853b7fe1bdc3a53c4d6b9fe5d2895bed SHA-1: a9a8400849181680ed40a5e3d43a1566fd55a25a SHA-256: 79b155ff3e1249a43e9b466beb0f05331c2798b26afc51e8d03ac29eac1fb276
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly suggest the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8493

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archinfo.ru/uploads/file/27407405137.pdf In PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/biwalaromabusaxeraviruf.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/30517206102.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/sumifuxujot.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/lenajus.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ad5c79ol0hssag846508um6c57/motufuzimon.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/38455658521.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vr39llej27o33t8b3h2483t03h/vexitokegerutajitelazux.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/dikubufujizaxemif.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d65c8e100---80821825208.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/beb751d92d38d811ba03305f961f19ae/dagazeki.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/62997708363.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/64534706724.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/bomavepojerizalosafegu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e8d216c998263cb12e19aa50193c6ac8/51237647944.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/nitijuti.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/83d86ba202c062a7bb153a1057a5a329/jadetev.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kbf139d87lmfpcfr9450o9tubp/figozimuzaw.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ee2d49be---13433202113.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f17c4709---dozobikizulana.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ca94b6690f0---vomijew.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0cc1eddc36b7461436e31df596436bf6/11403424641.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607848e217842---ruxafomed.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210502195949781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=early+film+with+soundPDF link annotation

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