Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17a1ae9583beef0…

MALICIOUS

PDF

75.5 KB Created: 2021-08-28 04:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3cc12939fe0952158d86a8770834a92 SHA-1: d34ada3f72b4cb9f19e125b0fbaad23ad326e877 SHA-256: e17a1ae9583beef0671b458052bff71c79df0d8cdc5a96b589d3800ab4c28b71
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://copy2d.com/ftp/image/file/46640148237.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb675884a3---85550084625.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/lesutumazepogewalobofale.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ecc1f9fde0b6992bdedd4e325a7579a5/xofadasos.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0h7r6lmq9ctmlhl0eut0k5vsln/47892084914.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e8d28ddc---rituli.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/53046406404.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/powefejizumufe.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1mg70om2miispjv326iqmjvd62/geroforoxuw.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/zadeser.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bcebe7c28---dikolu.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/dagudosawuzonuvoxaxokevow.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/xelafobobasovidanilukiga.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7c88e4cb0d2bcae0104e0fdca5628e74/mipusolisisojuzimenitad.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e313b786---xuzokesaxuzujizufasoman.pdfIn PDF document text
    • http://ruihuitax.com/files/file/ruluzupefexotowugomiz.pdfIn PDF document text
    • http://innersolutions-uk.com/file/negomomuvo.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/62651072321.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5826ae76e---kikid.pdfIn PDF document text
    • https://wineart.online/userfiles/file/rereligakibulip.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fbc42b9f9---13656364908.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/lesiduvitusolojenimatiw.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17237572150.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/45192585920.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/detoxenoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=up+the+river+down+the+riverPDF 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_off0000c5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 10272 bytes
SHA-256: a72d9be96d9b0909d2ff4aff0fafaa7ec63d6d5575130a1f0e3a62449feb5031
font_02_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 16656 bytes
SHA-256: 1b73bd6359c7787fdf892f37c00bbcf28dab2cd317ddad2c991f1085ede59708

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