Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ac4f25f342cb61…

MALICIOUS

PDF

105.9 KB Created: 2021-06-24 03:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 684bd25eaf4dbf695eb35c72a96903ab SHA-1: cd1d12142d4ce37cea43f63a13e1c7c427cbfbe3 SHA-256: 59ac4f25f342cb6109c6a34707adeee7f9dba04871a41857cf05f1a4974c92ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the links point towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/uplcv?utm_term=canon+hv40+manual PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f95e733cf---39028373405.pdfIn PDF document text
    • http://rurisnet.org/images/file/fegexomupasuborigo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/714b76fae126a4df9c5f7541b715bc38/49878852343.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f35b340c---xepuralu.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/22e473750cd865cd9a33a94866527315/marova.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/91984651991.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/19667601753.pdfIn PDF document text
    • http://metapolar.hu/tmp/87148248917.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/21c3785ae4f5ccc33f35920281aaf6ed/wuzurirewetudopikisexemuf.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/zerup.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/b3aqlea8a57edvfg66j9mta00b/fukorakupuveto.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/55510479149.pdfIn PDF document text
    • http://centrons.com/uploaded/file/112065204060c7bc0cd273a.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098002aceb---81459929521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00014752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14752 4848 bytes
SHA-256: d666132f352dab1518852fc6475f060352af0505435f0eea57cc2da524b5d810
font_01_sfnt_off000157af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AF 13952 bytes
SHA-256: 55d8039dc5a8066e6fd0cf3686e29777e77eb2ed1e5e97a6bee3322ba913255c
font_02_sfnt_off000183c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C4 16244 bytes
SHA-256: dc743b41e5c9b9e4d56ad8c22d1311c6eb3cecbc0d04401a7a33aeed2fa7944a