Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be8968a477c0703…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 06:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd1d17eeb350368687586835370aeee6 SHA-1: 96beb449f77aefb088b03f3ece54ca41a7794d20 SHA-256: 3be8968a477c0703ecdcc0c1890e986f49b140e9427f475a039430101cce6eab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cli-kh.com/uploads/files/202109210304063567.pdf In PDF document text
    • https://kiofruits.com/admin/uploads/files/46340733275.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/35746193305.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb26d1500---putofev.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pubapamix.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/peluz.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/49838274667.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/71459352834.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/21614829666.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480b5ccb230---42359235355.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161310c091f717---35700361656.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/zugizukifagafusuvokadal.pdfIn PDF document text
    • http://ashioke.com/images/library/File/65219655041.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/94898133814.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/65659481835.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/xivuvimerapasakepiregiw.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/tebagoxe.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/52771728178.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/kopafanab.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613584e8e05c1---wipok.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/8209734907.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/94493349023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pes+21+iso+file+downloadPDF 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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 10408 bytes
SHA-256: f9b87b2931f746ecc00fb368b3dd43ce07f6cdb81e4b82ca6935471bf3c39994
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 18500 bytes
SHA-256: df3c84f6faf3ab5bb82f58d43ff8da03b04fc90735ebd357118c35aba9769bf9
font_02_sfnt_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1