Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbbfebfaa8bd4fb…

MALICIOUS

PDF

90.7 KB Created: 2021-06-27 00:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e06f0429371b34bfa8446cd15fd0fbbe SHA-1: 4bd96c98ad49bb593be517905c6be774b69988c9 SHA-256: 9bbbfebfaa8bd4fb21c2a61ad9932c473ba8f8e6f7054fb2390d6e3d8bb54f49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or use URL parameters indicative of phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=cat+wakes+up+hissing
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1581e57644a5218f5b1b3381d78f7c85/78115765951.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9e662d5c---65523979655.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9a09ad609---4615053410.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6orgga87t0aqscs158tg45mci6/97143761535.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bddaab713be---rexaxelij.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6df797b99ad7ebd2ed2a5b1ac7410f49/73602824467.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a970215a18e---tekigurin.pdf
    • https://whiteplacard.com/UserFiles/file/58934729281.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f2358e52---98829621377.pdf
    • http://drivingschool-brno.eu/files/54351708676.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/73203556877.pdf
    • https://scanclean.bg/upload/ckfinder/files/31851695960.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/123dd28b695728f5ed0c2d1ef648f54c/filaranape.pdf
    • http://baigeleather.com/userfiles/file/levijugojafufojutu.pdf
    • http://thamdinhgiadaiquang.com/img/files/53786524939.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c506a263416---52702940377.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b789373ee---pabaresasuterer.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f603986d49---purazobizeropako.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/li9gkondecu8lf5cfrpbq7gia7/fugisofutubujowozakiwaju.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f12c16e6---lidezuxexawarir.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0032ab070e---29019089127.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cis9tnglcan5k6sk2quijsu9n0/vitarigepivisem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010028.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 16792 bytes
font_01_sfnt_off0001183f.bin
9aa703ffee5f6b23678997f4a9c5e2f484e3f667991a2ebb43dd517bf5b60f73
pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 10572 bytes
font_02_sfnt_off0001306e.bin
8e5f9ac7a39513a01d3010f092423a1120c6eb7579e9d41a7d6ff6211bf20bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 16912 bytes