Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26bc53ae846d521…

MALICIOUS

PDF

88.7 KB Created: 2021-08-08 00:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e996c0266d336419d21a9ac7b6c5aaf4 SHA-1: 57a91f27d9efb5a4939f5e46f56c0a01438adbb1 SHA-256: c26bc53ae846d5212d1a7a3965505c28e623cf855aa8862fa8b2367d148e0855
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=3+idiots+movie+720p+bluray+download PDF link annotation
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/kimaxozuwozavuzu.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/golupakijukejafi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f84a233eada---xilafasurowaf.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/3345816043.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/munidotomixurelimifu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/af252064ded125bd7921d427f6bddacf/85748223143.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c910fb96a0---75362770217.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/gidizilarisowedu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/99ed2a6d1e9e51b8ada5322a3401b7ec/fikenukusozoguvabazu.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/94433743602.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/11992934368.pdfIn PDF document text
    • http://swadeministries.com/pastor-sammy/upload/imagecontent/file/silibumamujam.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/311db90ede5b4eb89c0bc33e0664b0e1/82694044426.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e84caa7a77e67cdf06a86d2fed9e9806/kukobiwipewudejepavikuzew.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/begozuzek.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aef61b4e008---rosuwuzigovawisin.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/de7e44e311a7ea25efeb5af03fa03788/referadarutiloxesegol.pdfIn PDF document text
    • http://turnyras.lt/Files/file/wopuxewarupakasoxifawubu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d86305144---55189011979.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/83445717936.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096973dd9b0---wafanatotexurupazofitipam.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/685fa497d3d0c65cc52826e3902825f0/28471560863.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc8365a10---39486597431.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_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 17508 bytes
SHA-256: d6daabe5f802441cbb50e060e28ee0fd6d95b054e52eb1dd82f64e1ea018439f
font_02_sfnt_off00013a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0C 11424 bytes
SHA-256: a839dc085a909d83de3506a0bf13b8b75ef2c4b6e403d1d650627f381d9a1b2b

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