Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4489c7ca6d85da…

MALICIOUS

PDF

103.3 KB Created: 2021-08-01 20:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e50fee90ec982da181f372c673d6c22b SHA-1: 9906e2f7f8b08b319ffd1cf9d8de36b66a863a12 SHA-256: 0b4489c7ca6d85da5722b244ab6262d140f45e32efd7e3598054cf58721fdee3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites or disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://stylekd.ru/files/kituwat.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c342d54d853---lonepeterumuwefo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-10/20210710082908610542.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/30639061247.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tibikawozokave.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a416d0e9785---17406140081.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3b2dcc1434bbea7ec7c02db020023ad0/94388556423.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/fexosizarepupof.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3d55d517d21921905cb5836d46ba7fa9/35581244836.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/ziladisosesexevaxep.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210611_56A37F5E15504DA9.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099314ae7f26---66985296144.pdfIn PDF document text
    • http://flomojapan.com/upload/files/77912142403.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a27192c2---xalujopenatuwasotamo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/12100e08f125b6cd6bd52636d2bddfa0/11929402766.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/365839cdafd4a670d213a3cba8657c80/jodaminipo.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/6187868923.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160978541c8df2---95406072544.pdfIn PDF document text
    • http://cecev.com/stockages/files/39977801672.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/81796924339.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/52820750668.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/88595374982.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2n2uatrnc1mathdub8tjn6qtpk/74655953979.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/49146748125.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ofuc27d1oq5tjokkqlfq7balff/23239261038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ejercicios+de+n%C3%BAmeros+cu%C3%A1nticos+y+configuraci%C3%B3n+electr%C3%B3nica+resueltosPDF 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_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 19848 bytes
SHA-256: 9aa4807db7b965fc594c30fed5bd17611e8a81c79d9a9a7f046545eff4faab83
font_02_sfnt_off00017087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17087 11580 bytes
SHA-256: f2ea2f4e10f03c6579b88198cef1a0faa1165ad6e65d183e59e928aefa38e8d3

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