Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de4b09c0032b977…

MALICIOUS

PDF

93.3 KB Created: 2021-09-02 15:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f77ec4f7e3b01faa09effd83c9248618 SHA-1: dc1daa14d3ddc95e2849880966c58ddc8f774df4 SHA-256: 7de4b09c0032b97755a34a9556028dc6715464c31bd0f89556cf13d85b793b4a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the structure and URL analysis point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd068d5b8b---28767722315.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/6278882417.pdfIn PDF document text
    • http://azizolace.cz/images/file/jozebunufugaxu.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107181219289968.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/31701043474.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210826103418106.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b3c99dace331a858b97cc56fda8f09e3/57662691522.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ttbopb5snl6sb29ogo4j3p4k8m/27682494696.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6386p1r5grudf6hh1cv7fn6hk4/23630444312.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/sukub.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/durekaberijelegobubate.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af996043c88---89650224878.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/3315656545.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/jujejolikozalid.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/kovejasulijafexakuwimunib.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5r6d04vj6mrt5ono49o12a56h0/31417650539.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/19221074468.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/nivejalorojananisikupogir.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/xokazagumeridadepumitubix.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/modizituk.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072b2e83d3fd---malaponuzivetenave.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/798d01cbf21ad2366985e3e40f778794/47674212792.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/amefag.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0a8d4442dfb895794d9304598e9d7f84/rigijodubi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8ju1cg0qastj7ansu1eeh40fko/89347127338.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/bizuvobasekirikudulefonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sabbath+school+lesson+2019+pdf+easy+readingPDF 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_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 17308 bytes
SHA-256: 3cd3de0590fe127304dc4a754a68480e3d0a8c809dc67cb584b279812aa4e418
font_01_sfnt_off000133b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B5 11692 bytes
SHA-256: 236af134cfd0c3ee135f51d92c71714e0ad86eb15e51bd4010535a31b836ea51
font_02_sfnt_off00014f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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