Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77ab4849437ac24…

MALICIOUS

PDF

77.9 KB Created: 2021-08-03 16:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1780edf1c17a68a444ebb06f42a35bef SHA-1: 049c93bdaacce408fd5aa43e1edd3262cd2345c6 SHA-256: c77ab4849437ac243c0aea981ef43ec57271bd3e3aa84a9f26c8e3b08a02e306
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, directing users to various compromised websites, likely to download further malicious payloads. The presence of numerous links to potentially compromised CMS upload directories suggests a distribution mechanism for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.dfdtrading.sk/ckfinder/userfiles/files/15068544460.pdf In PDF document text
    • https://aczv.fr/userfiles/file/nigevoba.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/968fd24c64fc69ccbaa3aec69bff19be/31591735556.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092973ee1d60---70498470179.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/touivg52h6ossgd67rt2aabklt/tusot.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/b2cb0e8990be2989cd0ae63424b2b9d2/rorunivafuzekonaluxovogaf.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/faforoburabiwaw.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081214d7a80d---48054003225.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/85742599847.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/bamavuxokejivefikiposug.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/41822079953.pdfIn PDF document text
    • http://jcpingie.be/public/files/lobazudel.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/29793352770.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j15g6lpvdpu2kh14s5jcr4642f/buxumukolukemo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/50379ce6276b7941cf2e889098bc8330/seduvozejifixozakad.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070740623768---wupubodukirefijezazewaxub.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/fabivifikukolibazo.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/3788798671.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ade02384a3b73b2c4d4fedf50defdb4c/47784888740.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2c543ccba---36766032854.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1701c848e9---15384571127.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/23731274494.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/mogal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=emil+und+die+detektive+german+pdfPDF link annotation
    • 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_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 10796 bytes
SHA-256: a304b2cba025fd86fa2d8eb4fbcca8436526daa8ca8e47720f988d9e75a54480
font_01_sfnt_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 17600 bytes
SHA-256: 75b122b68ea19546cd167f36acb739415516298f0e537c8f16fefe1c34e971b0

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