Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3f2cca20f4c837…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 00:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e34e4e6e2e46b546b0581328c9751e71 SHA-1: 08d63ddde04af6e708e9913eb220fc1cc7cd2041 SHA-256: 6a3f2cca20f4c8375837b5cd721fe1e4a4893c327ffdd8faa0e1c8a94b9a9049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://archism.ru/uplcv?utm_term=pokemon+black+rom+3ds PDF link annotation
    • http://cokhixnktientien.com/Images_upload/files/wivedaluredejibumis.pdfIn PDF document text
    • http://salwex.hu/file/55611072824.pdfIn PDF document text
    • http://119pump.net/d/files/99017942522.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/75045062724.pdfIn PDF document text
    • http://nanopena.cz/upload/file/20522869792.pdfIn PDF document text
    • https://quizai.com/uploads/files/74666296291.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613495d7a930f---xipuxifaxamezapo.pdfIn PDF document text
    • http://hevolta.com/upload/file/59242232915.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/69403119920.pdfIn PDF document text
    • http://limoride.net/gallery/file/jawer.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3dc15421---25330961556.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148787a10624---87425464982.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/47731457938.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/dilinofoxilumajozarorisop.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/gifalib.pdfIn PDF document text
    • http://schubert-hh.de/image/file/90769571512.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/70699036914.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613343f4a1819---94081670152.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/bidikupiwuvonevala.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa74f98f4a---46235619244.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/jozaziritatejit.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/momgcaq042qf6q0427o1j01lvb/fijomoga.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_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 17960 bytes
SHA-256: 7f8acbca582cb278a256c6bef4f2cf46beb93946689058c5c723f1d94f1b5261
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 10748 bytes
SHA-256: e372a33c1d6a659efb815339fd13669f4699bbfd6e2bcbb09b1f5e93941697ff

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