Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fb3264898febf9…

MALICIOUS

PDF

89.8 KB Created: 2021-09-05 04:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5f4cc0b8b378e8221f8b4f0cfb920a0 SHA-1: 080525ab2df2798a5c9904c1e85ab977d17be73c SHA-256: 03fb3264898febf9ab3d3f9907b80ab31e84cd9cbbeebaaec2bf0c7af9d2f024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=vw+passat+2006+repair+manual PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b494f316---44713861123.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/73517893563.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b475f2d08d2---kupenevowomakajunetof.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e610020ce33---jejekuwasixo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/780c34c4d578cbc3be4c29cbfb5fb84d/muvexujukijasaros.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/jomopej.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3a7d3353---40075892224.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/67979683991.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c321aeff2---25979985846.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/39655362913.pdfIn PDF document text
    • http://le383.com/uploads/files/dalejelu.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/bitodolitozumano.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/berodikegufogesenexesim.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/rekilijifalasodijakilemu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cb6732424---ganopixoxup.pdfIn PDF document text
    • https://esvigo.com/upload/files/87267856404.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210608062809.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/47314760039.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/98572727932.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deec8f8df78---dunerado.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de23a8d31cc---gukipaletubifivesun.pdfIn PDF document text
    • https://slide-bearing.com/d/files/50525722300.pdfIn 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://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_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 19672 bytes
SHA-256: fbe1c47d88d3391d07f8383535ea79b14e30a0f3c5d55caac425c84eb56ca830
font_01_sfnt_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 10860 bytes
SHA-256: 74538739db730cbdf09b39b6852e08178e09ec8a56efea16e2ce606e1ef969c4
font_02_sfnt_off00014200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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