Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7aed5f9f50617f1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 11:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4c18649d05ea9ebe7d67dacea6ae01a SHA-1: 94c35d5e60d0140b3660d1211c330c902dc1222a SHA-256: d7aed5f9f50617f1608afd6753cd1b1872ef58279c3025e4e191efaa44aee2a4
204 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to deceive users into downloading a payload. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=god+of+war+3+android+free+download PDF link annotation
    • https://resttour.com/images/userfiles/files/46649106612.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s07cfbnsu52fl642r04n9ch43s/96380877421.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/8940834052.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/xufafoduvasuzufuwikelipok.pdfIn PDF document text
    • http://apicn.net/upload/files/55938395890.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/93170900165.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/fapumudur.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/51168508876.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/93876218322.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/gigilejidigufo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133b3d930535---30107786732.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/42617368335.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141819008f0d---vifixusumepupaxunaroga.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/budakumefujutifa.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161478a615fa12---58987478861.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631279229.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/59149122059.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1db83e6337da9e6bf7cede82c31b2286/juwudikefawapuj.pdfIn PDF document text
    • http://okvin.org/userfiles/file/wusakobum.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/38812299503.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613caeedd6e01---40316256589.pdfIn PDF document text
    • https://noventa.cz/media/files/file/82330627386.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/12798186102.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_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 10380 bytes
SHA-256: ab2f50315313ba5bb46457c85ff83b684fd2b8283ad244daa15cbdd052d584cb
font_01_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 18564 bytes
SHA-256: e470b17e510a5b1793b83b1cd19c54562541d12ffe69fd7906217bf35a7e9f6f

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