Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d09185ea6bbc14d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 21:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83ca8aeeca0fbaaf463342d48575f800 SHA-1: 81f91f1fc8496dc5258414dadcbd5497a77fb1e9 SHA-256: 5d09185ea6bbc14df0cdfe21e392aa183097a61c0310cda05c360ed21b7698f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=pokemon+platinum+gba+version+download PDF link annotation
    • http://goodfortune.hk/UpLoadFile/file///24202754684.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/dalotatowolezenamax.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/ginanafexakeputulewagolak.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/tinisub.pdfIn PDF document text
    • https://alev.az/userfiles/file/70961897108.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/51266079305.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/67886016454.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/73098941848.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/96545037463.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b097e1ec7c2b09cb532bbe62e68cd2ec/79880301962.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/dajudimotupuv.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161323a20e03f2---5533160034.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/39450908539.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/zivejapafamelu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19017363e---57240843052.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/tqc56ns9drk1238omsnd95d324/ganexoruxugimu.pdfIn PDF document text
    • http://teknis.it/userfiles/files/48967427947.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/62653186833.pdfIn PDF document text
    • https://sergiomauri.com/images/file/dilubikebadalum.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/67808761725.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/kijevazumipilukezi.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210916_0FFF9790704D1C90.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22710641443.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_off0000c59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59B 11220 bytes
SHA-256: c8de9974862ef231b4c1d398809425858a65cfc8f4cdab6a3ac9e5aeb193d864
font_01_sfnt_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 18236 bytes
SHA-256: 86da20ac96d6c3a999e18b556edda5efc6dccafd9d588df839f06f511f8b1073
font_02_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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