Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c328bd9a8fb38d…

MALICIOUS

PDF

93.8 KB Created: 2021-07-06 06:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 389c5eb256cab96eb30c7ef872c12276 SHA-1: 2b05669137a2ad8b2e0bfe84a68ab91591d0951a SHA-256: 73c328bd9a8fb38d8c25a5c6ca798cb2b130ed5fdd4b7d103ba62e9cbe21c615
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's part of a link farm. The primary function appears to be redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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=life+search+for+meaning PDF link annotation
    • https://leosservices.com/userfiles/file/1206676158.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/mitorurijipisez.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbb7d3ae2b---22895573621.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609928acbe9fd---34925654617.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xogukit.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/503cd0d6773276d9a57ed19114fc76fc/bifoxawifamoxasoropejalot.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f398290da27c99394b47dfa4cce09d3c/81060377751.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/87194233093.pdfIn PDF document text
    • http://azizolace.cz/images/file/24485492903.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/54284041607.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079968a18eef---pokolilimojubo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2a814ea18ac89fc203c5fe97b8eae7b2/butukij.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/724d3561afad9c873957decc754e70b2/20059804485.pdfIn PDF document text
    • http://fygl.net/uploads/file/30025947929.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6a9f25f1043fcf32948dba999f6aaddc/rorev.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bc5pqn9ld07a2fao95dv1n8hsn/dovuzem.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/11079279647.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea8e0716c---kazumafara.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d6b88edef2281c8b9597fdf341380c5b/77551128532.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d378016bcd---12125392577.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/23093038754.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_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 17604 bytes
SHA-256: 2ea3375d77c4bcaf1299464ce3ba4424b0c0c65536c0b157b27b0fa6c10b9cab
font_01_sfnt_off00013a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2A 10596 bytes
SHA-256: 5df6639d98d0b15905d7df3ec7ab19825a0e1725562d9540d4e308b6fbfe1647
font_02_sfnt_off00015232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1