Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a006d42cf27dd7…

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 10:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 101778133d134ef5d2774e20b391dd7d SHA-1: 3a1e7d64eb18017296ab09cac054a0cb07c885ac SHA-256: c9a006d42cf27dd7fc8bb7bb03388de4a9b8d541d6afae142d757f2a2e0de6c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document that contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable hosting, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b1977b3ea0339832c77eae89e862da42/vubenabazirubeb.pdf In PDF document text
    • http://murphysbeads.com/clients/54316/File/27422910002.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/phq6pndl6bf1n8cq5l1gima3la/74662447261.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/sivomejeraxosiveloguzun.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/74274bf86b202f8dcb0a4581dc09e1b9/pafosokilosizodufuda.pdfIn PDF document text
    • http://cy2hand.com/userfiles/37614352572.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082117f0b5a5---35022025301.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/gotowusafilegup.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607007070d6c7---xefoxetajivodafotakigi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93452e559---7442142895.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/1408295279.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/eo3otrrclc9rptt97aie26are1/23256935395.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607323f5c48b1---movifudar.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/lutofofilozaginev.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e337d493---sopuvidupixuvemevukulor.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xaribefoz.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c21e79da2cf---tepibikolubigog.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/86998929224.pdfIn PDF document text
    • https://dm288.rs/slicice/file/70709608498.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/53698441341.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/otmgdud71il9aur6jl1bfcgj4g/2965662919.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/jidiwujafuzukebisofiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=coughing+in+sleepPDF 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_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 16800 bytes
SHA-256: a58194e2b96b9ff621a5e06363b6320743789ef813d7963eac027fcf377aea48
font_02_sfnt_off000130f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 10300 bytes
SHA-256: af6b60dc9bf15a0c168055f0c52ce7b2d77e67f9f1d0d19474d44c62eaa79734

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