Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d6b6d550253078…

MALICIOUS

PDF

134.7 KB Created: 2021-09-04 21:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ac625a37b639a199c4cba14cb2b481c SHA-1: 19739aed561ec6ca1870e2e3dcd2b8589a5b06b9 SHA-256: c9d6b6d5502530783d9a2b4e1178eea167cb9617772c14e7c01b5cea2fc13898
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF viewers or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fafc7dc75e3---xuduzu.pdf In PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/22616450291.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ejpisci293kui0dkrdgdficskg/pokote.pdfIn PDF document text
    • http://fabtur.ru/upload/files/8310061059.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/64708967876.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/tolufudexaxuluzuwuluzase.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d96193c7609e87ebdf41c79a77d5808c/fagaz.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/11308166680.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/vojebuzugoxisabunufe.pdfIn PDF document text
    • https://papiratisk.cz/soubory/18939086552.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/3de8cf30840d6e6ed2b82451dfdb23b7/73707358707.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/mopevinovada.pdfIn PDF document text
    • https://dietacud.eu/upload/file/89736939770.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/lenatol.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609da07cc1f8b---guparakejubidekonate.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gq91j11bkp4jrunlcdacshos5u/vunidenakekofixewiwo.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/jisulosolaza.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/16358245025.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe73712ed---pegilenabu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609edae93ca14---runezidep.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e137622d0c4---xufozukupogisosabadizu.pdfIn PDF document text
    • http://coffee33.ru/archive/file/8223847915.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/57166151932.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/besune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=spinoza+etica+demostrada+segun+el+orden+geometrico+pdfPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/78119421065.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6EE 11200 bytes
SHA-256: 905c3f7a9bff7578727fabd34b9d5aee6612a6d6676d91633e93b5ce28bfdc3b
font_02_sfnt_off0001d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0EB 23264 bytes
SHA-256: 79ac08bd5e6f1e0c66ada9db56ac217fd74fa730724a3eb885c35b22be8ead32

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