Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc2523d266fcb24…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 10:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4723fc4505a71b264812cfd3fab85ce SHA-1: 7db6ce8b2497ccf63696e51fade34979fec97095 SHA-256: bdc2523d266fcb24d89c49dfff9ede186e7f0c1e3532ac2d5dbb711da2995036
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=excel+get+filtered+data+from+another+sheet PDF link annotation
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71093970873.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/97380191815.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/pojeb.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/86390762280.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/gagizimipedixesewuwibeba.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/6589712889.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/41ajibggaa63p569kkrv9ud9h6/8418555759.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b9445b6470c0c99ae5f725b5ae4f617d/77756998579.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/butekugotiwutek.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc8c5b35c6---70364539808.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/pomupazumazonusixixovulox.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tot843n0mkrsrja5v2nqim9726/jafofuzojopulid.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160949b8b6f395---lapudokukazekodugagalinep.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/32967521852.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b528318c---85853838835.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/8ac1ffbda848ff7e7db8a39aac04a964/15915636643.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/34197431645.pdfIn PDF document text
    • http://delve-cr.com/uploads/70555188184.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216cf4698ea---visifivavinawomozi.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/73237942386.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/jf1qsbvaafku75eakmn4es0ol4/57926231602.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/89819674262.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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 17796 bytes
SHA-256: 30d830270a8c5088c57bca77aff912b3e76d217e34f475ec800ed9f03ccad33a
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 11008 bytes
SHA-256: 3dbd83f2930431927f3160ab3a726f601279db0e77efa52954220d463a04b774

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