Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff88ed53009a2b73…

MALICIOUS

PDF

74.9 KB Created: 2021-08-31 19:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be15c4c9b01cc4e2472c9e87ce45bead SHA-1: 6882c614e621d2606f638e16eed177cf230dbd7f SHA-256: ff88ed53009a2b73dc5a13ed1cbc62e626d98415f0443e35fe3b5278e26f45e8
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many of which point to domains that appear to be compromised or used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to phishing or malware-hosting sites. The presence of a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chongros.com/userData/board/file/wowelawamo.pdf In PDF document text
    • http://www.urbanwaterways.info/files/52913979781.pdfIn PDF document text
    • http://104408017.linker.tw/files/sokodewositajarezebap.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e3d00f1e---zofetudomizufubezerib.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a856b21f8d4---36771428425.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/voxuzezalino.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077579d446ae---xipulukuroj.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/kokudewosegogaxenirazub.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/lizitak.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/71538719768.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/gunopa.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160947911b6e0e---jomix.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/kozamivod.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/18de24b473c0671339707f777e75973c/70400374031.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d91d1bad---16063024630.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/guvododorikek.pdfIn PDF document text
    • http://markone-tools.com/upload/files/62033277565.pdfIn PDF document text
    • https://bdcomunicazione.it/file/pixoterufumawukijavobusav.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/dexokibafajaz.pdfIn PDF document text
    • https://peterdegendt.be/file/revumetadamatorul.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b648e815c9e---pozofirekiwideloxowufu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173da32b06---jusek.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d916a39b9a555567e99d6a6273756e55/72292201812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+colloquy+of+monos+and+unaPDF 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_off0000c2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16304 bytes
SHA-256: 95a6c2d551cbf68e709300bbc579b8a81ce797e0ae0069f647165b476e8eb331
font_02_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 10772 bytes
SHA-256: 89dc07233b92155284fde779278f45081067b730a5142d78d58c7189b9f825e2

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