Malicious PDF — malware analysis report

Static analysis result for SHA-256 91178f4f980d244b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 11:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4a94a9f237cc30d00b7393d37ee5146 SHA-1: d90cb71d96e8dd5c46d31e9a3c5675ff667aad60 SHA-256: 91178f4f980d244b91c2c87db41761b98c864c4626c4d3f776eefa0efaee660d
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external domains, many of which appear to be part of a link farm hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of urgency and callback lures further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://smidgel.ru/uplcv?utm_term=general+knowledge+questions+and+answers+pdf+in+marathi PDF link annotation
    • http://rm-centr.ru/uploads/file/gefizovorag.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/jekudawerufuwojugidoxima.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ba50705496389819a5788c623e3a0ba7/17175833525.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/fabosijakuzinuzivov.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/84182308787.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/dixab.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/31082984299.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/gemigekoxewi.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/zinexexadulinelusire.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/pipumu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321b80eebe9---73937051970.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/95224809316.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/42846569999.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/bobujovu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75ca8b0a3c1b9b71d529e02f7e06b413/sewonutulikinudavozuni.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/71593802660.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4b2cc2799161ac757da159efd7fc9de3/53175185328.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/jibevitidijapuverujefajuz.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lasavebenobokov.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161331af0d6c27---xipod.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210903063545.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/sixipi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/51ca5de4acff832dc5a6c3dbd2112c8c/58488823758.pdfIn PDF document text
    • https://olterus.info/contents/files/zekenaxuwelorafuza.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/movidevokexobozozijisixos.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbeb09745d---71144529284.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_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 11408 bytes
SHA-256: a6fbe0065ff0d44c63e23385c225af8b97f95fab5c4ba29c3fd3be451a604c0f
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 17936 bytes
SHA-256: b711d60d76727f5682c3194f4254229a399260802b20525709ef1eb8961e94cd

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