Malicious PDF — malware analysis report

Static analysis result for SHA-256 5445cd24fe5826a7…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 22:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bab9391ee1c2aa72bc9fb86887ea327 SHA-1: d1131f2eb5134a8c9bd5dd7208e601a60d7a6596 SHA-256: 5445cd24fe5826a750b55396662a2a479020daa887e39dfaa7bb5616eeeefe20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=canon+imagerunner+c2550+service+manual
    • http://1qjd.com/upload/files/2021-06-28-21-01-13-nhqMkWj1.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ngfi8ch9rkioi81ooapeajnbkk/52836041866.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5b48cc9ac0b500a0d216e6e7945076d6/wavosofufewazonafiran.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/juzavikomuzawolan.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/86643836959.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8q1ihto072l0dhiqqusi1r8bgt/pajixeg.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f1b5f97566086d348db88a3d4c0d92f6/62364822331.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3739b3e4b8df50115cf5c131a2817544/414970529.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d08de501d---17722146582.pdf
    • http://ligneus.hu/upload/file/fadoxigidigojipexazuzikax.pdf
    • http://www.logomarcanet.com/userfiles/file/10810703953.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/4eed3c32706c6b933c64ffe68d696ca8/14644142200.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c6f81f2f8---41749788350.pdf
    • http://fzcce.com/aimgs/uload/files/44619189685.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c41527ca7a---53538090455.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e2b813cb---gefezizazolabukulen.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f77aeb4b---83343856185.pdf
    • http://massageindex.nl/images/uploads/falumus.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/pogazolimu.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3410b490145eb09cb254d54e2b167ba0/luzibodokovafafiwuwukowe.pdf
    • http://aldara-latinoamerica.com/userfiles/file/tupigegemafowozag.pdf
    • http://studiomontironi.eu/userfiles/files/mosunixerojevezugedalo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ce.bin
38e687f23cee2279826f806ed7080351f1d5e3b03de0f102cd712ebf26e4f995
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 16752 bytes
font_01_sfnt_off00011274.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 16792 bytes
font_02_sfnt_off00012a8b.bin
2d9b0e4466a162581aa5cb6203ca884b2f59e6908af216c312fe133c80142c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 11048 bytes