Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ed85b2907dd423…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 20:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30469853a2824f6accdb30988f06fed6 SHA-1: 577fa58f0ffd81f1bbec000ca4731601f6324499 SHA-256: 58ed85b2907dd42332e39bedea4294f12e695c238d5d0dffea3e2d9b5a78c9d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads, strongly suggests this PDF is designed to lure users to malicious sites or download further payloads. The embedded JavaScript is likely used to facilitate these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://urs-certification.com/gais/image/file/85047631370.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/jikizimibelife.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/rejumefotifujepevijate.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/jabop.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be56a22ff---92825108314.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/fozogibelisezowufe.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/89961285640.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c93c2b9d9547c424dbbc3e0ce13f25df/kosekufawatiruw.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a407dd5d49---kapexepuzitemem.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/tigiwaxajuwabonadoz.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/jidujenopilanuxobu.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/45229251739.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/24021777662.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937d647aef---18496056486.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/gobuvij.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/visinemedelur.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/mokuruwi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/688bbitit0kqujjc39v6flmikl/terutijonegokudizujonom.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0f7512bec7148c2e871e00e20cf7304d/8925803782.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902035814.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/111c706e8ac9071cf2c0d9c272eab5bc/40972496144.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/migoxazerix.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/zawamofesedigebu.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/91244505221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+auto+ringtonePDF 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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 10288 bytes
SHA-256: f9b6c03c11e798f155c990a3ebcf36ea5dd45b39ba31a6b4c4c949d6f8f82a7b
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 18072 bytes
SHA-256: 07b93e4dd55ec3ec61694b726d80536f2e2e47ea52865d6c72342ebbfc16872f
font_02_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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