Malicious PDF — malware analysis report

Static analysis result for SHA-256 4235e2f0d2143dc1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 21:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2cf88d7f8301360053b1fbad1d0400e4 SHA-1: b213ef1783f9b44665bd0c63542fe9eec136803d SHA-256: 4235e2f0d2143dc186a0d6b46c587b830f44a877a82edb12fa64df8f67d5fc1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external sites, potentially for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://jan-fotografie.nl/upload/files/mumekuwefigulujofalu.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/49fabc97934303b064160de361d0881f/fezusupagigovufiwagas.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/82f45365abc93391aeab897c8a4958d8/77189825350.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/81892609010.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ll31uu4ff2jv4gv4fnrois8b3r/jamemoletiwabol.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/71156549356.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/8a695547cca6a36f94c900b0ed3e0fab/goforaxuwigoze.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091d222cbee5---parowomunin.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/65310643583.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/zixisujixopubiritu.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/51240660390.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/05f3216bf5c91521489e9d92481b26d4/gotarafakonefejapid.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kewud.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/monoxexifuvanefur.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68027667737.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a67791f8---58364131747.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3eee3422f8037a173c193acb684184e/10905316240.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/98154407423.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e48a77c17fc0f6219901072ac8719c4f/lumegaf.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/779132186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=5+love+languages+child+quiz+pdfPDF 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_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 18300 bytes
SHA-256: 62730c27c45e1967e1985194442713b6eb0f02ae9746a8bb663a18e9ad242ec0
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 11112 bytes
SHA-256: 516a47478af2b14be2158ddd922c48bcb992999a7220f25686eda4b317c91ede

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