Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e9b27e193a7376…

MALICIOUS

PDF

99.8 KB Created: 2021-06-20 07:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e80069687b73ee84c7eda1c900ac871b SHA-1: 55a245099faa3d7e9f556eca4f382590804737eb SHA-256: a6e9b27e193a737654b81c6d88850f468773af0da67d4011603c92daa368889e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm or phishing lure. The embedded URLs like 'https://irlanc.ru/uplcv?utm_term=iphone+11+pro+max+camera+mm' indicate a potential attempt to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=iphone+11+pro+max+camera+mm PDF link annotation
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/d0069d41ee4aed0c22e7f67ec781145b/81451591278.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/et7dmcj5q2t6gk9ivt26pobsis/34147009055.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/18849994592.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/19852375058.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/namukukodiwafuref.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/nosagelemurazi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a71f4e8c299242ee842b717652cff890/7962286298.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/81496716480.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2b395900---48155366093.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/40070104981.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837b89c84d---fufaribamaxinenap.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f4tu4ujuuhgmniboqdfgpquta1/70287778657.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f22f303599f6d5c9543fde5a70b96416/xebaliletad.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9s5cnstatrp8j2d3h7jf5bgbv3/57389382368.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zomoferelupadivibukevodob.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/dirole.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/64882812208.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000148ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148ED 5020 bytes
SHA-256: b8d3b4de5893095a7635742844a5c9b94d4b29ae1de28bf3bc8a4e8e52e7958d
font_01_sfnt_off000159e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E0 11376 bytes
SHA-256: 2dda145f63faab1fc882b18fae8c802acc6c7eebf6857b41d51ead8047eeb192