Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b94d0956302bab…

MALICIOUS

PDF

95.5 KB Created: 2021-06-28 06:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f90c7d61ef9536673efcbcb2ce9fa2c3 SHA-1: 9acfab0a2cd1f094ca191252b0302b285b103b21 SHA-256: c9b94d0956302bab559916ad6dff08e7dbdac69865d749f21aa224bd3ebc2027
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f07ef7d64b---53899917439.pdf In PDF document text
    • http://cleangroupbd.com/ck/upload/files/80358395629.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8a0925ad---nuladizabisebuxumum.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/10110998645.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/093f694394ac235de7a2f581cd7401e2/fukorilusoritinuxozelemu.pdfIn PDF document text
    • http://ashioke.com/images/library/File/woxodewezomir.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fe9u4hibj22ou3hg4qvbptjsf/fuborozis.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9645eda428208f5a22c9e29cc0459f8/towotepanoxuwafurafatu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d9903f5db5a05b1fa1a4798ab773a2e/garofox.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/26059242105.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/aea321828681c48ee41f06acb75c211d/18401824127.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e246200ea9---kiwaxosizok.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210528130525.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/kewipik.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/15271613554.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160859e6fd0f6e---62224697008.pdfIn PDF document text
    • https://giustofiori.it/file/55345492403.pdfIn PDF document text
    • http://sam-global.ch/files/file/27912944004.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2b9a6574---sofovasavawojojozoda.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094561f223f4---vovevipipa.pdfIn PDF document text
    • http://iphysiology.ru/upload/kivakizorodetarumi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/29ef8010dd29a5a7df270c60733ac84a/28953643751.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/wolel.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/60036736907.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/61818932388.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/xinebuxosuguwesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pain+in+my+collarbone+and+shoulderPDF 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_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 18448 bytes
SHA-256: 3df38c034b5b4ac36c18f88d3aea800ef5bf8cc45b8c293b9df3f24248660632
font_02_sfnt_off000157dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DC 10892 bytes
SHA-256: f942d0c0bdb1605e1b26a802f9fd80f3a5572043f8b9a2aa530374c6f1ea2b39