Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6ea0df4faf3f0c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 16:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dc34b8eb981b0b3a0fbb2910b78fac1 SHA-1: 2852fba5dda4d31d279f32dc3eab94dbc68b768c SHA-256: 9c6ea0df4faf3f0c69a776c98937bdb534ea17ad5d5addee9a0ace2a3bfe92fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=architecture+home+design+books+pdf PDF link annotation
    • https://ags-car.com/upload/files/ziruzoniki.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/rawis.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6bfbd09d6036a2fde6fd26dda05335c2/52582341865.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8afd4395a6---wenivavaxodikovadoxe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7085e888a013d58165ccfc810413706c/96402687091.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e75c001e078---noxalebirukigunap.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/99141804621.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/24908863992.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a7523d92fe66255718f06ef7ddeb5ed5/niduvabudizewutes.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8827c84d78c68ceadbe709656285c0f4/37586731592.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d722122d2b0---83933048522.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/dajefa.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/kisorux.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/julowisebima.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160887512d73fe---5914627354.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d41844eea6---galebudano.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/duxiwinemewazugege.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c885663359d---84343301032.pdfIn PDF document text
    • https://scalper.ir/data/files/file/zugirofatedes.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/41516370427.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/79943018742.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kezigukar.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/wakedixolorilonebixibif.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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 11172 bytes
SHA-256: 81ed82d23ef24fd01ae7811c2a7fb3174d7ee7a78ca40d75da6824f97815ba02
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 18192 bytes
SHA-256: 85e7661f9a81548ec8d7402620180f2d9eaa99db6c4005f0f75456cc60524ff8
font_02_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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