Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4d44ad882dea41…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 07:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b09cb21916bd1cbe90f7d4acbe24105 SHA-1: 0de39949e1c22d7f64fce731d8200aa81d3c4fc1 SHA-256: 9f4d44ad882dea41ce161aeca1216c480ad5d3aa16f054b3609481e23967b958
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farm heuristics further supports the classification as a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=angrej+movie+songs+mp3+download PDF link annotation
    • http://aj-freight.com/ckfinder/userfiles/files/bekenolugetopufivosu.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/pejerufuved.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/lasijusopoxed.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9c3c0622a54f66c25802753395cd0669/gigesenafetilipir.pdfIn PDF document text
    • http://kdekdyjak.cz/data/92458152278.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/77073953882.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/16736255299.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/kilekenabisozakaximuxur.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba1528889b---77124454632.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/wenetegukinimogeni.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109020100449215.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/vatubusogewatet.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lijusabasamenuli.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/79618797429.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb54c28e9---melajonu.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/jewelaje.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613866ab1b796---nabukevagixurudatovojorik.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/rulokiwexodagime.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/ribikonuzewuzek.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/gamikupebupakivagakigobi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/30092964732.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/62546716376.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/11244777899.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/rikilovuvitoxutex.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_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 17020 bytes
SHA-256: ec23a3acf572081ee4b746a6fea80efc32827eb2621c5ef17f7c36fc4dd552ce
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 11072 bytes
SHA-256: 82bc90b3deb70998e8fea33ad8a97609e19cc5fe181ddba925b12e9cb86adc94
font_02_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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