Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b9f728f180bfd4…

MALICIOUS

PDF

76.2 KB Created: 2021-06-12 23:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6254d81fb3195a680a6b9b9cdddf35ac SHA-1: 465ecc3417379a049fe8be452975f661842a66f2 SHA-256: d6b9f728f180bfd40e5ea1cb9071682ed8d1db900d92da909134161ad1ad9aaa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It 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 document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a snowman theme, likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=frozen+want+to+build+a+snowman PDF link annotation
    • http://autodilykanka.cz/cmsimple/images/file/fekunodazuvamuxotujofed.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/smujdbsemmpk6mjnjqk2i1rggo/duxoziwolusexi.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/gunerulagabidorogux.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/94a156615f5b6be4081c18ef7ebb4311/49493090673.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076027030c12---96858483228.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab932524b8---suborilimurivuful.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ktugv76vem7rivm5hqm0fr4960/98891413448.pdfIn PDF document text
    • http://snsi.jp/image/news_file/3141505668.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab707ea2616---nixakeligiwuxukifil.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160841dd26430f---65686928051.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/7aa1d487d0cbcb01539abfc31844b7db/54377433518.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f0947fb4---vemurifomuposasitufej.pdfIn PDF document text
    • http://jucal.es/images/file/daregoletelarito.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2cb50dde9924875fc89b747f598953b5/97840118127.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e747b22314---bekipiruzoranuwok.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/gefilipapesanalililot.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/36838632452.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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 5208 bytes
SHA-256: f6a7d9201dc16e4758e2a439db3d63126dc7be0c3a8cb7c14991e5d7e6086348
font_01_sfnt_off0000ff60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 10788 bytes
SHA-256: 218277d8c49df08044d9d7a46fed1651520a1f671ebe87dbae9508d93e5da2b8