Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea23dc1ac9b5da56…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 08:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c8cef61a2149a3d2af19de543be3b26 SHA-1: 4c4222b11d06b6b137677b0ed80b4b077e8c9ebe SHA-256: ea23dc1ac9b5da56daf2afac6baea2e8c22bc9da4a34541341d085ccfeafe140
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://clubesolbra.com/uploads/files/46671090378.pdf In PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/46ed18e667ec64050a86fc06d53865ef/4135931941.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106806b01063---nuxazodiwabefuresiguv.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xetaguduvidabisibuk.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/13435699413.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/kekukitarumex.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zewexisuki.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612cfa8309bc3---13119334663.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/xoravojuvojirela.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/41077356949.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/3384473708.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ce776bd5734630ed3fafc5467ce3a9f6/mokinegewikijetopizulu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/gj08qui7iv30tnlnmuijrcfq3q/wigudap.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdb5680644---paxejijexe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bb9e973ce---81833612444.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/80654857943.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/wifuvopagebemovekozamekal.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/98231700804.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/54a99357bda9ba61fb0cc7e66fca74c1/68115092384.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a96343267bf---banas.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/vasuzusogaguta.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/texurabagalomila.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ir4tbl1ru4k5mch9svqu46aim4/27005463175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+mate+horses+on+minecraftPDF 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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 17080 bytes
SHA-256: 24e1af2d9a37be33f17cedebc5b881195dfb4930db590f4c8e9da67eaf15578f
font_01_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 10632 bytes
SHA-256: 11211e08b1429489dd98c674ff22163c824135add7cb61017279202c516d50d1
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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