Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d229434a1f1e89…

MALICIOUS

PDF

101.8 KB Created: 2021-08-02 06:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3db2bafa7d531a0f0bc2fce8119d4c03 SHA-1: 08f083d3cba3bfbfeaf510a00d3de497a5fe7adb SHA-256: 44d229434a1f1e89623de03849cdc89203515536f3fc80b814b4bfbff102ea25
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=what+is+a+corporate+power+of+attorney PDF link annotation
    • http://a-swiss.com/upload/userfiles/file/65105777649.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04188d65af---birajudaku.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609174e25b343---divilel.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/92767785917.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/f226v72tig1lrb4odc0av70fvf/wufoguwusorafu.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/zoguko.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/90835298826.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/64s047tgsfgltsmlb41jvehnn3/mepurijefuzenep.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e019d003397---bisagomugotonupavenexaj.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/87194911325.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/60524015344.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72e7bedcf---72196908245.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/72409197462.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41346545c9---guvoraligapalikejab.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/p90h5jk88ptqf40relo2octvdo/9823601191.pdfIn PDF document text
    • http://weingut-suppan.at/files/43752280418.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7871d604c60c9393a0bd352d12db83a7/17877246844.pdfIn PDF document text
    • http://llux.vn/uploads/files/kuleworojunexovopozo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/bmsa8eutm3d47djd6ccu9kr0db/93414198504.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/pakexevuwezizegutobal.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/oc3q54b15va236vgbn4tqf8s65/3831585726.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/40089837787.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_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 10724 bytes
SHA-256: b67621a044c0604d03b8d33f9f3962fdefcc57019fa5d9b43369af39741ce130
font_01_sfnt_off00014656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14656 16464 bytes
SHA-256: c18232b037174b193c6ae47a7372641e2956856ac7bfb5cddcf9bc2b4c01f842
font_02_sfnt_off00017110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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