Malicious PDF — malware analysis report

Static analysis result for SHA-256 26831fffaf0e7976…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 18:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03f263f2ccb8b10c3d22bd7dd5ea1723 SHA-1: 4e2e40a78f05116a8720ed968d489b1dceb5ecd3 SHA-256: 26831fffaf0e7976934916e4f57c90bd33002017ebd8419ca81b5ceb7a18950a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://pierrelemagicien.com/userfiles/file/84458059671.pdf In PDF document text
    • http://danangsculpture.com/uploads/image/files/2381564792.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/fibemagefaforapikus.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/30162591279.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a8093c7a5b9e4cb99bfebb2e9537f728/mirasutebufugawugulowutu.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/silofilinaxuweladu.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/8222929824.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/48312388861309dc74ab5e.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/2756758666.pdfIn PDF document text
    • http://pasted-radio.de/web/files/gatisaposedelonakuke.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e34ca0952e00dfcc758743f598d3bf6d/wivud.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/35585864816.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/84237107832.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xaretulusuzabova.pdfIn PDF document text
    • http://sissonne.hu/editor_up/favawuxupasutakabawif.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/povebugedu.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/dajuxunotusopuvebelizoru.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/53221122590.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2d9skr66nhb6154ejkohibiag5/xunozuka.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/jewufisiboromavakunapawu.pdfIn PDF document text
    • http://qdjshg.com/files/file/kagikubonu.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/59046572500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=techno+gamerz+gta+5+mobilePDF 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_off0000b763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB763 10808 bytes
SHA-256: 2b0ffc56ef33eec6e136fe896211929956059738fff91aa00834bf1a2a616b78
font_01_sfnt_off0000d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 15932 bytes
SHA-256: d2130cbe32a628c51be5484dac23dbefb3be1b901b624a11aa2b7eba4783e84c