Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9c23ad0503124b…

MALICIOUS

PDF

84.4 KB Created: 2021-10-13 00:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c14b7cd9bbef929099ed39c67481e055 SHA-1: fc7c9065f6993e940dc6239e077597dcbdd8b454 SHA-256: 8e9c23ad0503124b04f11b52ae5aa2efac9b2fa0438a54286053e1a63393a93c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics reinforces the conclusion that this document is part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.de.ruben.pl/ckfinder/userfiles/files/suvakofipemafazime.pdf In PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zevovedefugaperaritu.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/dunul.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/tejegixesujewanevakabu.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/derowukug.pdfIn PDF document text
    • http://ihdbd.org/upload/files/69054374486.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/jifepufezagekunamuluj.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/63864973694.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/52191152650.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/88286967284.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159fa47f1909---pabilonu.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/77372536532.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/10693945890.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615986657d6f1---79876986067.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/66718504927.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/87764944573.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/fibolodob.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/94626380769.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa0c93181---81748010576.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/rilugevafopi.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/48461525737.pdfIn PDF document text
    • http://sdes.in/uploads/8189100955.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/80545634663.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/73007437378.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/wajutolosalotaduwiwored.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/98225648849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=request+letter+for+certificate+of+employmentPDF 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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 11044 bytes
SHA-256: 19e5361569f7996b15f10d5958d89aff99e079da9c4968073cebe6928a950abe
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 18088 bytes
SHA-256: 1564ee3b3864257b0465fb74148dee17fee686fb99d4fdf1a808474cad68d544
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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