Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbefb4fd557a391a…

MALICIOUS

PDF

118.5 KB Created: 2021-06-26 03:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8b16e32bd8111aace39384c903af7ccd SHA-1: c2f9fa9abfd456cbf48beb70ddc9702a396d127d SHA-256: cbefb4fd557a391a10e5a36344b477cb38343d7926b712029b6ce177715fca0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://rubyyadav.com/nbloom/fckuploads/file/vukapulagezane.pdf In PDF document text
    • https://synersys.fr/contenu/file/83646072776.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/lirasesifazigemeris.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/wamedawirulow.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff8e97f29---tusavuzalufogifaxitugi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bae23da9724f4c91f9d2a70c1a8f6ac9/timosixadajetidepexogaled.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/136127a3641ef522b6eb8b5a89a35f0d/varovupibalokawav.pdfIn PDF document text
    • http://waypl.pl/upload/File/44107332512.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5iiiocq6qr8ovi96hnv1q061mo/gugelazoniwox.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/tusefinupa.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/lobif.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/f26dc45e2ec40712f160289a98220161/rozefumolegotelutifewuno.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8cdggdhbk330rtd8f1fjascfj7/13238349294.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609061f14553b---demujodomejupowerures.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/acb3158eb4a323acaae9fe7114fc3e0d/71335206782.pdfIn PDF document text
    • https://plasy.com/uploads/file/61164609484.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d63841ea8---susugutaduxob.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9a195te7uiham42m6tgnp9v445/58104458468.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1b08f5f43a90b26cd6036649e030c22c/pozotakokevusapaz.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8e454c50d3c29bfbfa0a8d4aef108f2f/65939648975.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/edbd6fef71e42778a009a7ecaa24f977/gobaranekazejijafikidijo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/87ln7lcpgmkoukqt4bhrboail5/50460946576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+prestationPDF 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_off00016ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000182e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182E8 10480 bytes
SHA-256: a35bf91c9616b135ecb77cdd66a7cd817d09d6156ba5f00fb8d774803e35dd35
font_02_sfnt_off00019ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AD7 19016 bytes
SHA-256: 9c6b0ffd3ced669f62b9de7feccc313a85839710ce6d7afd84264ddaf6d672db

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