Malicious PDF — malware analysis report

Static analysis result for SHA-256 403c7efb8df7d3c9…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 11:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2e419ced50f997b7cc43bc13b54055d5 SHA-1: 6b269fd89b7daa2ce5e1481d5507e5a15228641e SHA-256: 403c7efb8df7d3c94bfdd1f64b34de4d7ba2c34bd30ea534a1624af46f528497
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting the PDF itself. This suggests the PDF is part of a phishing campaign or a distribution mechanism for further malware, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/d0aeb3bc50d912ce58e3c4c9dc49c3c7/97411165889.pdf In PDF document text
    • http://novussiteyonetimi.com/uploads/file/mijewiluruninus.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/6024209109.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/89539285741.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/munageda.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/51771523726.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/78919765836.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4449435bd5---butunefixajan.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c582574a2d9---16770557492.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/97840712892.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/39063697510.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/56301898512.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d8ce00a9---10399867826.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/52633349873.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e262601aa---dovatigax.pdfIn PDF document text
    • http://chayka-svg.ru/files/11394069024.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/94774081015.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e60ktc7itn8oq208f5ren8s0nf/37661017372.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/jixanofivowanurebe.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7b87046b---11311243397.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/99907uted8bk94tmpn2oj12ghb/latuf.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a809a88c---94227944222.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cis2t92e0056fiqu66cnj12egk/22676863826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=read+the+bible+in+90+days+pdfPDF 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_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 17628 bytes
SHA-256: 5eba0091115f0ffbaa9cb1c6f6a97be32647f8cc698c1b9f3be8a514da6bd915
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 10964 bytes
SHA-256: 6d8c5c20a2a427af7dae72b92b12e6742061c5692dca931ab726854e649bc44e

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