Malicious PDF — malware analysis report

Static analysis result for SHA-256 383a1aed99c56663…

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 05:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5ca084cb9ece2cea3bc69376411ea8d0 SHA-1: c385f586d1a9a9db4045f846d254a9619263ca15 SHA-256: 383a1aed99c56663174bc709bea512f4a6ce5763fd7a2d7c8f08824c53bf6974
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=xenia+xbox+360+emulator+download+for+android PDF link annotation
    • http://zdrowejaja.com/Upload/file/47133159781.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/52215846097.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/6967244376.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/ralevodowemejabawarutagef.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/91794189419.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/pubirazibepowodididogub.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/15225335192.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614715efb6eb5---15003331020.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16148358944256---62855838274.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/49932691427.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/perizenileroluko.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08488ebbf---kipuvametol.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/56810443699.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219182151336172.pdfIn PDF document text
    • https://pixel.bg/img/file/genozumosapolenupepagag.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/degokidugolisuzipisotu.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///53297704668.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5cinhv7nf191i84lgsdirusr7r/fipivokivakawuwawa.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/14428707026.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/bojabifegexisubu.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/losewatujotunezer.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/1bd59b29357e89fc737354d2653a9617.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_off0000cc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3D 17892 bytes
SHA-256: 3ab8f674841f6a66cb78880037bd5aaf06d2da43abe9563dd96789c2050bdf1c
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 11244 bytes
SHA-256: 9cd78e97e145906b4b0c3dc80be4c2fddd0745eefe8194f8a6baf1b5bbbf0776
font_02_sfnt_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1