Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ff91e16de6b874…

MALICIOUS

PDF

75.7 KB Created: 2022-03-27 14:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-07-01
MD5: 46b986e1dd435031a3d53ea933fab4f9 SHA-1: 339e550f57fc7ad8ac49249ee8a34898b2249bd2 SHA-256: a4ff91e16de6b87488343dabca8ce7a7dc9e284178c42a99f10b6b3b1accebb8
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://fecuq.co.za/XSRYdR1H?utm_term=arkansas+annual+corporation+franchis PDF link annotation
    • http://kapsalonvogue.nl/files/file/kobemepemufubagidotol.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/towasipox.pdfIn PDF document text
    • http://suaups.net/userfiles/file/58445566863.pdfIn PDF document text
    • http://gysanya.com/upload/file/220302185339979865odzgjnrld7oa.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/zesasusotepogazugu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tijitogisuzuzo.pdfIn PDF document text
    • http://afksport.cz/upload/files/tomojelupejususowomu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a91f72fe22d95e3818aac5d31b1d94e9/77580866711.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/bifinafiwojulafuguva.pdfIn PDF document text
    • https://xtremefitksa.xbodyksa.com/ckfinder/userfiles/files/zinijagutoruzex.pdfIn PDF document text
    • http://pinboulevard.com/file_space/files/dipikowepafituwa.pdfIn PDF document text
    • http://bushurov.ru/images/files/fipukiwuzibupiz.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/bamutepipibutajiluro.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/73620302807.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/162384a1e7ba6d---15485506154.pdfIn PDF document text
    • http://moonyart.ru/admin/ckeditor/kcfinder/upload/files/15154807438.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/92703582731.pdfIn PDF document text
    • http://goodslib.com/userfiles/file/rebiwudipirijowag.pdfIn PDF document text
    • http://modero.vn/upload/files/vokezikorexawuziwarudetek.pdfIn PDF document text
    • https://cbmpolska.pl/www/js/kcfinder/upload/files/62978418127.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/28080130772.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/92648678608.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16236bac378a4e---votilarevi.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/ridedegesavik.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1622653824bf52---84497782406.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/wurukagiwavojotufoxot.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/lewuvagikaz.pdfIn PDF document text
    • http://faithhh.net/js/kcfinder/upload/files/wiseselid.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/fopugamezoxaxoreripejas.pdfIn PDF document text
    • http://xzavod.com/kcfinder/upload/files/vasajevikesa.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/288923182.pdfIn PDF document text
    • http://internationalelectric.ru/test/sites/default/files/file/7239234969.pdfIn PDF document text
    • https://myleague.vn/uploadfiles/kcfinder/files/zaxebazeromimigakoji.pdfIn PDF document text
    • http://greenlasthousing.com/admin/kcfinder/upload/files/29479147184.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/85122546040.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/28874457404.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 extracted file (font_00_sfnt_off0000c468.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000c468.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC468 10616 bytes
SHA-256: 2171e6549018a25ce6c9038da3cf5ab2efaec43946e0bf236d8b3d061a3a40cd
font_01_sfnt_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9
font_02_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16980 bytes
SHA-256: f8b1c45e938e845d67c5231eea24d051a18f014f3fa8fd3315a16f243162ca9f