Malicious PDF — malware analysis report

Static analysis result for SHA-256 2834349d87d0744e…

MALICIOUS

PDF

102.8 KB Created: 2021-07-22 06:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 05e0bb03830016fde7bb1f9e564cdb65 SHA-1: acb541cb5c077926c928e24d59e88063915d13db SHA-256: 2834349d87d0744eac355c848125d8773a2be998c7c181abd3ef817845260883
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, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://gites-les-bardots.com/userfiles/file/60160078234.pdf In PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/360295c65ea0ac9c7beb7d8dd350e52f/79834601442.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f10b07cbc3---97406055666.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77a83b139---59143680044.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/punidabagave.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ilub9417ghf5dfl97pdtbc669p/dobima.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/612cefb2d47b0eaf8c5579dbf8dea363/93427575504.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b70433b3a---vujapulipasejovofek.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/dupusel.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad67cdfd6---regesujuwesokezonuzelaguv.pdfIn PDF document text
    • http://ktcz.eu/files/files/puwilagunigeralovumusese.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/48682985626.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df2af658d36---juteduwutaxefudom.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d31f2416---mawunavakusoput.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/nulinegulijexej.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/dexubizisazupefe.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e43cc12a4c---52488935180.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/ligiroded.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/11175589516.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072b30ad83af---85568847522.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a1d7c062---79945508052.pdfIn PDF document text
    • http://rurisnet.org/images/file/bagimerazaginitupegabole.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/jomujigijebodebodasum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ano+ang+overpopulationPDF 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_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 10404 bytes
SHA-256: 178fcd51253a545a5d1a91a51031462689d851e5d34de7a0c88537a1a02b43bb
font_01_sfnt_off00014755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14755 17212 bytes
SHA-256: bb960b489add5406af62a38ab2227317a52193e831c7bd2401e496dc69082265
font_02_sfnt_off0001744a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1744A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1