Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3904da8b813320a…

MALICIOUS

PDF

87.8 KB Created: 2021-07-31 04:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 823949ec57a911296ae1c4e7ff002311 SHA-1: 3277c042417c63cf3dbe0a258eac7d550c218ed7 SHA-256: f3904da8b813320ab8b21ad3f3d03be46e5ddb0bd4491fec32fe3860536cc604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL targets suggest a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e82b3586843fdde198e6682cde7ea9c6/kowuruw.pdf In PDF document text
    • https://lawyerupsmart.com/tempimg/file/38528853426.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/bevetudojologukugalom.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ede63bf31abf22a3f21488012bcfd8e6/79296351319.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb51c9aea7---50303612257.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/aff0e313a893768381f0f82298867f74/vovosumapezas.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16feda2c7---ralegezadikebiba.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/63535118450.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qeorh4qf3nb56c2e4hopdktfrr/44679558778.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hupjj118cq12udaktnt0eikhgg/pifotibugolabenamew.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c041ced67---difaboxusatebali.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/bamewolefowosunezizo.pdfIn PDF document text
    • https://digicpictures.com/downloads/52497082321.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9e950a43552a0fff1968ec4636042f54/70299471707.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/8661981759.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/xamikome.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b3f6dbc3---musukonofevifukikije.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cfa3bece4---80589518107.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b5698c787---59808560530.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d2b110037f543f46b544cb6fe8242a28/66509486675.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/h7f7agaa65l0g45mljc2ahcs4u/69483639176.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb45958672---29981583003.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/30047e54c54e4fd98f69df4a12cce9cd/22713418426.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/pubopujoporivebuzevofow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=david+jones+santa+cave+melbournePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 17452 bytes
SHA-256: 77f5c018f86123120e7a87d1e77f9b38f16eacf1f63b21986b2f145915a11561
font_01_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001381d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381D 10968 bytes
SHA-256: d743fa086f2724ccdc822fee121bc60d5d36a124761ca20485c279268e7d2f05

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