Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e163385d476683…

MALICIOUS

PDF

56.7 KB Created: 2021-08-19 23:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa9e74200f2e743cdd1274eb4323d787 SHA-1: 032119ce6d4661b3873bef1dc01ea132dfb861db SHA-256: 85e163385d4766832e2fceea3b60cf097c7672b81fda56e89d106a177bf4a9f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9487

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://infrive.ru/uplcv?utm_term=exercice+sur+masse+volumique+et+densit%C3%A9 PDF link annotation
    • https://study-abroad-travel.com/ckfinder/userfiles/file/5278378015.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/werunufi.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/zegenexevazoviragarivora.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914629c72f5---55706694218.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/wowupemuvevazujuvuropu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/u68sdan8l9g1hi3926vm6nlvq5/81156904278.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/05eedec95ffacacb94128eff5d1272c9/6811461303.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/xugirefuwazesivurorin.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608842c500406---roviruno.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/65d775e2b16f61be076765ccc85eb776/98509064338.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe0abc603d---kavuju.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/tujejebuzasul.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/razorirugekeguxanume.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118168727931---98351908649.pdfIn PDF document text
    • http://terrietanaka.com/library/files/28754690343.pdfIn PDF document text
    • http://bwc.lt/i/7644852740.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/caae3dd2b95ee43d0754818c5300a9ba/xanotajovojakuta.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/acb4928283955f9353770e9d5136633c/29553279891.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/17393769220.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/l9lsnu7g9msn8c2uf0evlm8nqc/redilewe.pdfIn PDF document text
    • https://aspirans.com/files/file/17830900122.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b12efa9b4bf---xupisujerowog.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/36418343470.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/14576046128.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60ECABE3EEEAE.pdfIn PDF document text

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