Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ce4d7b7644175d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 08:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae79197dbb9f77e70e37bd10201b60a7 SHA-1: 7e877f552d07bf0f1327fcc828da9d07d1c7902c SHA-256: d7ce4d7b7644175d0748bd2ab1a4681a98e1495a3baa0fbad44fda7a3f2d16c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5f10089b---fojuvenaxofudibixejaru.pdf In PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/6484287577.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/vigulunejedibelaju.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/95149266779.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/71274596.pdfIn PDF document text
    • http://canoeing.by/pics/files/gukixumarutuvasotoj.pdfIn PDF document text
    • http://senesi-sklad.cz/userfiles/file/98561847498.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8fd1b6a13a7ef36f833221708777ed91/kamitukikuwaloxiti.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/32823625824.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e537f4e30209b16d289bfca71f5f5002/8974180052.pdfIn PDF document text
    • http://steinemann-ag.ru/bibazedesosumavod.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/muvizagudisunakuxabowe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c4f77cdd0600d719c4a28fca2a1f9820/fogob.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/57441223323.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/43537432329.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/gajibuguxusiladupurixipe.pdfIn PDF document text
    • http://lblussana.it/images/file/2220101506.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/47192578460.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/11173345020.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/85631576103.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/sisefaxizuxuzuxuvotik.pdfIn PDF document text
    • https://pmms-online.com/assets/file/gufolifiti.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/60014141788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wonder+woman+1984+socksharePDF 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_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 11076 bytes
SHA-256: 801548613ed1ce1fab20979b18b22c8ca7c25de86cac774b74b6424199a494db
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 18580 bytes
SHA-256: 56d4a3624a5e27ce2d744f1cd13ff9ff31745fa65f7bd81b5e3385d88646ef5e