Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aaf2de6ba65980…

MALICIOUS

PDF

78.2 KB Created: 2021-08-04 11:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a86d8115f32a5101d765318d216839f SHA-1: 8f80023b7d26a1ab0fffed57c47ead08412c3c18 SHA-256: 28aaf2de6ba6598055f591f527c8e798443dd19749cc2cb28500ff07cdbf2389
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further suggesting a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=lord+shiva+hd+wallpaper+png PDF link annotation
    • http://studiotipaldo.com/userfiles/files/62280354330.pdfIn PDF document text
    • https://mmszke.hu/files/file/22059168764.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/jutalez.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3444d4811702158cc08cf9e7928dbad1/59673436326.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/39162870a389c1e1f3f9d9dc04773dac/84793356096.pdfIn PDF document text
    • https://priscar.com/documents/files/gitegaxatuv.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0u9dm6tmc4jiqv6659lt10lvh0/podas.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/31388024865.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973f6d0da7f---38829296572.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/lunodoxufezores.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/76ac854725b5f73e7667832d80784039/nikosikodezasevil.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/sidalepujojaregano.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861a6cf22e---96530720925.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/db129085e11402ca26113a52db8bddda/73267398850.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/614b44cdc243275581cbe09a755ab410/xemul.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/42400021348.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/svdko07uq3far410i4tr3de2ds/71908807551.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/polaga.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/lusexesefagekozojoletudob.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/17195874507.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/80785962778.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/77014062376.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/1711004085.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/85096434075.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/82qbp378ocgib7ln6m0vurejqq/mujokarefuwuredapego.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2dd50e8b1e0910a52d30780ffa6c9fb1/zoporuwavin.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_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 16804 bytes
SHA-256: 0f8c41cb04cd5cb275dff59a0fb181e8676678e6c10d9d8614e4dd526cd05b57
font_02_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 10680 bytes
SHA-256: aa9f75824463729935d01d4adc369ec9d910635c09320f5ecf5ce78cced4393f

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