Malicious PDF — malware analysis report

Static analysis result for SHA-256 39be0c141a3356b2…

MALICIOUS

PDF

90.1 KB Created: 2021-07-24 17:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d15bf012102e0c707becf14718c210a SHA-1: 3e7db9571186ba9582322d07c40a76598fe95ea2 SHA-256: 39be0c141a3356b2d5e83e56c4ecb5c5d207755b8b5b83916ed150bb13ee54ee
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external resources, some hosted on compromised CMS uploads, suggesting a link farm designed to distribute malware. Notably, it includes an instruction to disable security software, a common tactic to facilitate further malicious activity. No scripts were extracted, but the presence of embedded URLs and the security bypass instruction strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/7eea90110b852d05ef6fa8315e52484a/zikabufofilon.pdf In PDF document text
    • https://discovercefalu.com/_data/images/file/ripikekunowegipaw.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/29071109479.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062123112342.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b286c82b3---povavavigeva.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa8f17ee7---57615022087.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7820a31397d96ae7b7e7f43478c546f7/jimarobadibavex.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h2me8s3slk9cqb175auii4k5ev/90790637268.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/pogosiludurazupogud.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/dejuvizojetajob.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jiqgd2jus0iaoj7eeec1j7c8ci/68610176239.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/91122945226.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b35e4d9a---belutufinujuwawirirule.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e6fdd12cd---55125196198.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bea15db42ea---14062557114.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e78e4f22---datos.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/86862178580.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/fukifitusoted.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/1715255068.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86101ca8a---51600149816.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/33547700338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+download+medal+of+honor+2010+for+pcPDF 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_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 10884 bytes
SHA-256: 3777ce45d66ba6a3054989e8d4846e3d2136af186a6c732ec8d646446ae4fb05
font_01_sfnt_off0001133d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133D 17704 bytes
SHA-256: f1573af3e321bc30145f3af314b4d3a6be4bf011730c1820f2293b8d89b10f13
font_02_sfnt_off000141d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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