Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2c13d8f92c1a29…

MALICIOUS

PDF

74.4 KB Created: 2021-06-23 07:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 72ce8e715d740ed0acf1b78b4924dc4a SHA-1: 8ffcd453facada03490420da2fab6afc373fdc4c SHA-256: 1b2c13d8f92c1a29a9a113ff07ce55c4cb96bc6e3304007a2b08b72d40dd2174
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though truncated, suggests a lure related to makeup tutorials, which is used to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160840d4116879---pobifabat.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48fb2fc1---ribajajuzenuwabenad.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95f6bda39---tevitizud.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fanogajelaxokejipomow.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/54558108a441293ea10943a4601e9774/jinefi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//89308313249.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/jelofitavibebid.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe86c9213---94195863576.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vusuv.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27938498f---24521503183.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/94679802855.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd85ce6daf---67526821284.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ad8c4d2b1458502eb692375b29224667/fenabutapabogelosuluvobow.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f60f4e77b2c2902a15708903575f3d76/71057172469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+art+of+makeup+kevyn+aucoin+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 5360 bytes
SHA-256: 4364f3262ca0d52140e48a93bf295485ce28bb2569ca355a3a1f90ac5e61eb96
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 11736 bytes
SHA-256: 7d61381bdc3af62bf2780f8a3d68c26b97838ec25df354d09f1e396edd5e77b8

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