Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaf35cc396352b1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 00:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a775c05973e537029268ed290c36572 SHA-1: ac8652f8237f18886c803aaf21eb1ab7c95b6689 SHA-256: cbaf35cc396352b183de6b0e710617bab0d884f6211b523df091317eab1d1520
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/redibokajamizig.pdf In PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/xagurifunam.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145180e7862c---87141411314.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/69283787940.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/20421351313.pdfIn PDF document text
    • http://rooptex.com/uploads/95146242912.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/roxibagijadanebevimi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613526b47d678---seneke.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/51843565442.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3161599bd895db0c1a5dd9e67905d305/42525765694.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/narotaler.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/sewefigidapotelina.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/30223799037.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/milatuwagusizejapiwu.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/xozezenarum.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/parexaguma.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/tatino.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/benimidedoj.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/62597344716.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161464b9ac4a5d---reteve.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/23137234887.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631327108.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/donelufufag.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7de2bf1ba2390e3a44e01653d984bd8c/57337549625.pdfIn PDF document text
    • https://sergiomauri.com/images/file/25580738854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=truecaller+gold+hackPDF 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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 10344 bytes
SHA-256: 7d5b95cdcb65c70cb9bcd7c8904972fb47e5e72dbc352a669b95aa2d8debaf60
font_01_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 18728 bytes
SHA-256: b96b7b142b2fcc7ca2acb42520e0181d65d021fd9be9c8c3e8a7532e3aef1aa3
font_02_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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