Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91ed962480542b7…

MALICIOUS

PDF

93.5 KB Created: 2021-07-03 18:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e6257d3650700514e906b5f21c75d921 SHA-1: bf0101dff39dcdc7b4f67ba2cfa2d9c556e467ff SHA-256: c91ed962480542b7c20fcad3df979d98fe2a7b40df77aec0fbf15eb8472a06d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and embedded links are characteristic of a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=pus+filled+bumps+after+shaving PDF link annotation
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dc679e125b237d06b9c956da6b9101c9/3668482098.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609421921310e---bovedabuwarexuk.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/defa7c04211a82bbf5f0fdecd499cfa1/topisosizelagafe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48eec838a7---raribigerolovitix.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87b641d957---desaguvekiwexonepuvana.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/subojumerumadoviwoganol.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/82497654719.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34e228147---36549285284.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c85445ee3c404148e6fe319a1b5bdf58/24267722838.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce63ab37f---97456494496.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa88489f08e---wabinerowabufugegan.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/sopekeju.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/pamugoruwaroperuba.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/jizepupuvesugijorikagufex.pdfIn PDF document text
    • https://csodamalom.hu/files/files/31712585522.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160954e61dfade---ratopajalokobipazuvisuk.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/mirokowepigisiligipep.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c521a4cce4---jukazoguwifewadisebeg.pdfIn PDF document text
    • http://cga82.com/admin/File/befopaxavogegapenoxi.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8r170sfhoci578i8l5anavrlv4/23480579197.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/bujolerakap.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/604e83475a9a50198e1e96b8ad5a9ccd/56969323459.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290845542185.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c11fe7dc533---44707928773.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7cd6374145742f59ab9118d40e22e468/7813191054.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_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 11132 bytes
SHA-256: e2cc8b20f379fb36c04a8d3efff6571820dfe4abaad1f66422f262bb8c560b11
font_01_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 17128 bytes
SHA-256: dcaf627dd03296dddaac31e94314866f8ac7edc37e0d150fcbec1d403876dd7d
font_02_sfnt_off00014f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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