Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2684c3d387cc09b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 23:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa584821e740cab86b58ced7b8785cb9 SHA-1: ff4f195027d4a95d74ad129c082c7897e05ae698 SHA-256: e2684c3d387cc09ba38885ed8224f278a1e0d5d724a5bbdb3e12431d6d7e445a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e8284c5227536539bbe6b891c6157c37/togevagejisovudaregaxe.pdf In PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630755130.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/33644281715.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/37394854076.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/68040827356.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/lokefasogomafonaboxaxab.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/93137616066.pdfIn PDF document text
    • http://tulga.ru/editor/files/63451500822.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/470f455f310039097686fbf3bcb7cf46/lafagalulotorudupo.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///joremegonutamasadapupazi.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/60334314950.pdfIn PDF document text
    • https://keongracun.org/contents/files/123693231.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/doxekenufepozirak.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/57707695420.pdfIn PDF document text
    • https://stotex.rs/files/mobapelopadatepipamo.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/32787447644.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161428b051a9a9---14446201428.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/ferisodope.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/vupajigapijifonul.pdfIn PDF document text
    • https://wecareprogram.org/images/file/rezexibesanomifik.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/89610097504.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vemegatafujagedazus.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/wetivakudotaxe.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/butiporob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=russell+westbrook+locker+codePDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/85479293978.pdfIn PDF document text
    • 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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 10468 bytes
SHA-256: a9b667cdcd7649c1954d5d1088d87603973b56062b7c1909c4186fb1ad5aa7c4
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 18044 bytes
SHA-256: e1c492859acf2de5e14183f4d88647165f29dc7e3c9832b8910afbe6c9cb216d

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