Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4579f0e8f0c16d2…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 08:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f25310c5182ef00b7e52a465aa83b384 SHA-1: a3ec9b695ed1699222bfe58e753acda7eb07012a SHA-256: f4579f0e8f0c16d25ace6a3d2c3910c4b8372f10387bb9ec9c7a3dc68ceed293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=verb+patterns+exercises+pdf PDF link annotation
    • http://archetipoingegneria.it/userfiles/files/regikifixokiforijamuvobub.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112f6882b022---zobutul.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1066695a1---45213013578.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd5f07343---xonusaworomizolisusigateg.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/7794a3e88a54674f6b3402454ea80ab3/93729229110.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ddc8110bcdc8b2412e571414c355852b/45501498366.pdfIn PDF document text
    • https://roshindelivery.ae/userfiles/files/watirilekanaxovamud.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/04jguaha57drrhs5bhom8ktqkf/25383739447.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/nadedaxaxitupugaramuba.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/01f218c22d9dd3806bbe1b8b9da9ffeb/6387474851.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6ce0d6e4675a1e74c4f11e50944c4cb7/26252078835.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/lafirapusopativez.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/586e6e6ecbf132718cd88ad0f1959793/terinanumap.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612774d9214eb---76468968965.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a77f30c4daf---pusediku.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tgs40kdgj56b7q5u178sf84j67/toguduzidekeligome.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/648b1673358921d8604a1f716514e28f/46583167696.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/32676169698.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/64755547874.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/6149544396.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc1076933---puwotosekinofato.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4cd48fe05---22280207213.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/83029217676.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80694519ca---xekosib.pdfIn PDF document text
    • http://unsersohn.ch/images/file/83555269198.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/jifenidozakupijuj.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9e32s6ig4leen58nnd73u40vi9/91706431917.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 10660 bytes
SHA-256: 28c46a7f4927acf708e037a975df5be5bb2298927dc09888346ed15619e7d9c1
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 17484 bytes
SHA-256: 12f218991495a8bfbd9e1772d3e84ab3d79aa3992ee60b4affff1f692d775b77
font_02_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 18704 bytes
SHA-256: fe2b410da0639aeeace851cde0d9f77970e169f05daf3c0c0e3c34252e255e49
font_03_sfnt_off00013886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.