Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95a8b0670e2747b…

MALICIOUS

PDF

73.3 KB Created: 2021-06-28 05:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46f9f5a7f648ef99e60a3dece6d508c3 SHA-1: 9da462d4be75eb98df2c4caac3922dfdfe18b113 SHA-256: f95a8b0670e2747b98415eb1e8ddca334f7976c86b0fa133e15b2a549758dc42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised CMS upload storage, suggesting an attempt to redirect users to external, potentially malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm structure strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/74d0407aa40a213995b0303f575c5fa5/72425540725.pdf In PDF document text
    • http://bluecars.pl/userfiles/file/43763593828.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091898908a7f---biler.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/qvbusqdud0e0bf6n4tom5t65sj/65820619094.pdfIn PDF document text
    • http://sowitech.vn/upload/files/78105667777.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9da8a381---32675206921.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096da9a48129---30627343297.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780120c559c---pubusi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6ddb4b43faeac71d7b365b5c6c927098/32137925278.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8be7853c830d50af369d43fdc5f57dd3/60629893038.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/96452246390.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/75218249910.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210603092708.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16248054254548.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/58468103038.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670afb85d9---duborumadizijewok.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4fcc9692---35468691222.pdfIn PDF document text
    • https://masihpt1.com/contents//files/molukozereluvetetibewol.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/929778c1d021aadc91ff28216d192cdc/mojalidilaki.pdfIn PDF document text
    • http://adveotec.com/img/file/gimenizav.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/36337190311.pdfIn PDF document text
    • https://invest.pl/userfiles/file/sufipuvuwenemarumudasota.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/ae18b7ff3d2b637615384a0de36a099c/26454054660.pdfIn PDF document text
    • https://icbacademy.com/upload/files/jixewiwujopugowilujunulem.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/sajudoxig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=advanced+php+tutorial+pdf+downloadPDF 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_off0000bd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD03 10780 bytes
SHA-256: 95ad53a0398ed363015e696c7a3d7400857210e3ef405f4aac8948f38a724f57
font_01_sfnt_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 16300 bytes
SHA-256: 5532fa4ce5bf921a73ef241a0eb775e939b045b8d533e9ac4b656a3e3403e642
font_02_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1