Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d481868b4434162…

MALICIOUS

PDF

113.4 KB Created: 2021-07-26 03:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2eb73f894b77acb97970bab8c9f198d2 SHA-1: 5f20a25a27d6299d1cd18f592f7eef4b10e11171 SHA-256: 9d481868b4434162ea778eb36d308948f97e99d93eacceca84f8790c520b6163
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://htlexpress.com/ckfinder/userfiles/files/xutiroza.pdf In PDF document text
    • http://ankurgroups.com/userfiles/file/13481648746.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/dabogojosepexatetavipawu.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vekafuwelola.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lpl45ai7uas1a5ifoulvtlulbl/89769145170.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2dadf862cc3200b78471cef6f0099dd4/30767937061.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c96fdc10f---91571940419.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/susamasitokarobaloxo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/pbs0nvllk07qteo5ss6s7odntk/29634830449.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/46444906487.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/52579014556.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0788f920---28565409035.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082de6b2db6f---58743061057.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/11815400233.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/659e836657c85adee9fd3aa742b12013/desiviwifigemujisuw.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/35047200777.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc2151e81f---41656366860.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/zivovonolidawibelazamas.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/fa2qpqb7k3mrnglbbr1vi388j6/2566818837.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dvgll4bafbgvvl3gu2oshhvjd2/netoninewopolugat.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077c63a35713---diponivurubinurewokedozu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a983c27416---15510998247.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/navaruxumidomezomej.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/nanabugok.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/25868186704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ejemplos+de+desviacion+estandarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 10856 bytes
SHA-256: 29c2039be18d77b8142e6adfde2473e3faeff1f9b75109b9cde2f6199767ddbc
font_01_sfnt_off00015434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C45 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off0001816d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1816D 19872 bytes
SHA-256: 0fa9a1a1cd85c2de59805e9f65d3c157198c21241beccf0342368e80ab5855aa

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