Malicious PDF — malware analysis report

Static analysis result for SHA-256 29385d0502fe3f08…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 02:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ba6b570a1cfce57e8996caa52f9028e7 SHA-1: c08fd381beeb786d2dab872d61e71db9a18bca87 SHA-256: 29385d0502fe3f0814c884c86bc8e405aa55b2708763af51cc6ff9168e68f424
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ctyrkolky-gamax.cz/data/dokumenty/47311414563.pdf In PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161390e87809a5---65064041611.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/3d5cc6c893390f39f3a89282b2603d15/pexib.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/59608083626.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/acad0f7291b16cd373003d14704b38dc/fesilukufebawenusuwezu.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/50716049682.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/52962419831.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/55489542730.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143b5f8e64c4---kitikipilivopoderiliwij.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/punijuxaxijubonolafiwutum.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140b25f37975---fipurukejavujofetowin.pdfIn PDF document text
    • https://renteci.com/imagens/file/rifikesabexewepodulitiw.pdfIn PDF document text
    • https://cmoretv.com/userfiles/nolowunir.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/gunurofugowagive.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/vixakoxa.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/88653247293.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/4112400560.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/gupuzepunufatitojamakogu.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/85509711246.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/jotuxewuk.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9c7afb61---99924225769.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/43384327870.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/98029404509.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/zosajimelaje.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/dimisepamowiditilokededuw.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/31218283337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=serp+page+rank+checkerPDF 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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 10296 bytes
SHA-256: 79f230e22469d11c2d2014b0974e7ca43a2ed6ded684b6042a7245eae097e171
font_02_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 14772 bytes
SHA-256: 6f1f5818042c06e14ecd7b527d45b04a62d2aed38a0f6abfd7403b3bfac1232e

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