Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f6a69a1f3be2dc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 16:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 648179b6dd8a32e9356603654353500f SHA-1: a72f1a81d3c31f395d61267d61e233412591c893 SHA-256: e9f6a69a1f3be2dc884372e03e21b98e8eae67f063211ccdb0ca79c1080ee918
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or to distribute further malware.

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://nomylo.ru/uplcv?utm_term=zanarini+rating+scale+pdf PDF link annotation
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439484c1523---86626477988.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130d61a2722c---tegede.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bl6estneuv2pai83hgrf6ga8s7/71131145965.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/lezovupotox.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f5cbc674f9a4976aabeaafc332738197/nomomotolozijuwojosune.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/dobupulalenuxekojawe.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d40d12be---fisiwosikipa.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/73247157956.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210905_130127.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/84836990976.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/76720045132.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210914_762D36AB76CC77C0.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/kurolil.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/kuborusisovufewuxagew.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/suzerol.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686e0b3c91---1528968208.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/pusutewovivekidiz.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/gadiporozipetaxigeb.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/duzukijiloravutizojoz.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/vaxazo.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/gedikulu.pdfIn PDF document text
    • http://wawa757.com/uploads/files/bofazemerosa.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/moweluduwapu.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_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 18468 bytes
SHA-256: cea0d789c08a3774e0ae38203457f5b5be12a995e57113ed2ad470d5fe6fb3ae
font_01_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 10640 bytes
SHA-256: b8c69b9fa2e8dd7b5c18f8c687641a54c88dba2be5e83cc9f79706ca4e960384
font_02_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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