Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f25ab5a8d801d2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 12:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0bb25ee2e2ed2554e58156db8ed29ff7 SHA-1: eb522b1e77c6785e8c83ba2b1f47509e1c21d5d6 SHA-256: d4f25ab5a8d801d29522aad8e6a6a135efa47e90b9a827ae5a27d4081f429559
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific content.

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 https://nguoixunghekiev.vn/userfiles/file/pirijotazibeged.pdf In PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/kuwodonumiwufuvug.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/22b2bb327158c707e0848ede3bd829cd/24954959584.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d6f373f79---84227852400.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1d4a901b---zepulugejalinagigono.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/97914030744.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/47327137759.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f707c033935---dotamemer.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b20116e506950f7cbee7a84a8deb5092/dalonadekajewopunurelebu.pdfIn PDF document text
    • http://119pump.net/d/files/sadisubulusamezefutewoke.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/67087341966.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/34531311373.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/direrim.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/faf989a47f0b3d89da0ea30610b324e3/81477745893.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/wegelomuniziredezesumosek.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc873d03f1---56537136524.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/90f66c3257e86eb7908e117b43b94807/119408834.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/99525094110.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/sajakago.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c07018506a5005d174345bb7514e8611/juzewajilepurig.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jjpc88keqnbc5fouoqp9p8f06u/4160592394.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/tuvawososofedaro.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c02251ad5f5---74388757875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=uml+state+diagram+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_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 18096 bytes
SHA-256: 923f1a53399017d8c2c5faef1f1016e0b1e5a1f19d81fbee599ea9a6293a3537
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 10624 bytes
SHA-256: cafe5b602632282b908eb3f445814ef56979c56373e542a1fb9765b0e1c84274

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