Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8f8960e4346438…

MALICIOUS

PDF

73.4 KB Created: 2021-06-13 07:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b5749c1bd5658f6d6b9cf14852fbad2f SHA-1: 17d509640084a563cc05e5947e59ab037a9c236a SHA-256: ac8f8960e434643846677b354ff32809b8a609f6a149d9d8b5bf035e0642a796
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous links, many pointing to compromised WordPress sites, designed to redirect users to download pages for 'mobile legends hack apk'. The file's structure and embedded links suggest it functions as a link farm to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=mobile+legends+hack+apk+download+ios PDF link annotation
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2d7ce35d1eca8dceb1194c65aaf72b12/xasanaduzaneji.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/nmedha50j8dacr848ev4sbu1e4/72894864858.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4q53onu8ici7vsrvq6746121h4/80937638551.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/74631256220.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/16975483882.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fcf29b34---zuvusikotoxojodas.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607424cacf6f2---sojebutizofulinukuli.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa672bef90---voripik.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b6865e9b8aa662dc5e0fcf992035a450/rojulovuze.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b538e65efd8---40506518874.pdfIn PDF document text
    • https://stvorki.ru/files/file/rafori.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/wodedojadove.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/92679a4bd1b6f4c8066ef11c458406bc/50920365109.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e06047cf3---17908176275.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978d4db6d2c---zarubegowemojuv.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/vlusu1nhua51n9oq5p9kieh4i0/94623183192.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbc657f0b---maluzubusakeser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 5540 bytes
SHA-256: c0e88f5193bff16ea05a6d0042bb9d8c0b8fadd5e87ab78396de6e1cfe29ee1f
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 11252 bytes
SHA-256: aff942470ce67c5a8241ff1595db339128ea892b1c1f63b4ccddad90a1f41ca1