Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f01a4d61d175147…

MALICIOUS

PDF

100.3 KB Created: 2021-09-18 01:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b7b291b0c7691e5909c0bd58b7b16705 SHA-1: b4a6e555a79f38d9e0476b953f0acd963c7ff942 SHA-256: 6f01a4d61d175147547e0c7d051e5fdbd472aaaa45a4a10d6d60aa616c6eb519
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains a 'Clipboard command execution lure' heuristic, indicating it instructs users to copy and paste content into a shell. This, combined with numerous embedded URLs pointing to potentially compromised or disposable hosting, suggests an attempt to trick the user into executing malicious commands. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://myappartement.de/web/editor/files/vuzotudidoz.pdf In PDF document text
    • https://lifetides.ca/cambridge/uploads/files/japetikusevubusonevo.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/98330493952.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/2035566955.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/sofum.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/nuxisidesakivadopowe.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/32083159000.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/kalesixoxunuferavefarexat.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b1bad8e5c---dadaduko.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/xipisu.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/30095800431.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/nenopuwazezelanej.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109110011492119.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d7d83ed5821b83c1e51b1e3191a2c9e4/vavizevepuwawogewubiloxa.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/sipurogomexerovatugome.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/tupafibema.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/72983283913.pdfIn PDF document text
    • http://jcpingie.be/public/files/82695155183.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/47452985446.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/gizukobunizerixowabika.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/vijerokimav.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/2288811022.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/be4a2285ff2acfb1d775068ea9275c03/kudusaraberu.pdfIn PDF document text
    • http://posuni.com/userfiles/file/wumamudeferomedasuvow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=metasploit+termux+commandsPDF 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_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 19344 bytes
SHA-256: 80f71f081b727fd11daaf321df785c57b9990d5c910207bf752162cc58515af2
font_01_sfnt_off00015254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6B 10872 bytes
SHA-256: b173d549b101fdff38d164fb397fccdf89a779c8003dc70d2eea7ce21e9930cc

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