Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdac17f7af98fb5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 19:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c746b0eb03a9742e52a3b81d156208e2 SHA-1: 3538929f49f9a6738baaea8b942960941d8e8a60 SHA-256: 4fdac17f7af98fb55859a38ae4b171bdc6e7aa0371816c9db25e7895d00f9d6c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as link farms or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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
  • 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://dailitara.lt/bites/uploads/file/togizelijojo.pdf In PDF document text
    • https://avigailpekelman.com/sites/default/files/file/11849681455.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097b0981e2---buvivavufa.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/gikigeletemupuwukelex.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/sigilemibarariverefoku.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/gatemunilegulasaro.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f937cca3001ca1d9482f1440e7e1c464/77429563468.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcd655fc24---39090013013.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/65820937713.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/dosigidir.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/gizenivobofu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210913124342983.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/84623393575.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/jewisiximiw.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/nonikawobugajole.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/dodinetusoxi.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/10912900520.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/zakoduberim.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/27362913941.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/35a1e22e26192d8145d7dff0df636fa4/sovefivere.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/33804793258.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161417f86f418b---71924603781.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/dogunenegowonepipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ethical+considerations+in+qualitative+research+pdfPDF link annotation
    • 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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 11012 bytes
SHA-256: 771c3dd8c380d54889865020b904d2cea27bfa18d62f10ce62977f18855a8b10
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 18408 bytes
SHA-256: 53d360c7c04c499317b67f978509982603cb1b079a5c7fc884deaf81adcaae8f
font_02_sfnt_off000131af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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