Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b42a55a357e373…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 22:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ee02357c45b37c72cf230939275d4e8 SHA-1: ca1f4be10f566551b06c28394b789ca6a8ad63d8 SHA-256: 56b42a55a357e373c6f9403a2eff4f7f38d1c155fc47fb4861eb16959a66a2b8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a tactic to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=adonit+jot+touch+pixelpoint+manual PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8qojkqvb9k09uouis4pqaqqf1l/makifuwelezeremafozasowof.pdfIn PDF document text
    • http://ccadl.com/files/20210706051430.pdfIn PDF document text
    • http://gibisch.info/files/files/29297914578.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7d01ef4ce63708975e4acc2fc135a6b2/70773190774.pdfIn PDF document text
    • https://ultralloy.net/upload/files/bibafipoduwajopokur.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f53f7317f---naronosaguzolaw.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/43046419391.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/juvedoju.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe3a8120b---18647931047.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b1acb163e23dc9e98bb6b323a6ccb678/xatodivepuvux.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9a48684783859a232cc9251a9178d2ea/15900288239.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/72803142302.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fcbcc9a36ba1a6292597c462e9305ddf/71554459307.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tuwirupera.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49348282389.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/6236431020.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/59313713252.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/80180915353.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25efb4e2af---zurelu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8e46c39c589eaac6d80654dbc0b128b4/kunafimes.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tdbbe4kroirqlibeaebheskah3/temiwolexolarogovuziveki.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/lovirevosozopu.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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10824 bytes
SHA-256: 6613e3462f973c4e08b38553ab0e4c3ffc62c919f1d2b174ee0aa1228326b56f
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 17980 bytes
SHA-256: 8ec16a55089c3ce40e85467b2272488a37d1423c7da8923003ac0092e45ce7b5

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