Malicious PDF — malware analysis report

Static analysis result for SHA-256 a708f3f87f5239a7…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 08:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 097a291297f50e6fc148a9fa60d6f244 SHA-1: 6540739030a43fa4cb13056d50dc5c4fc6f42664 SHA-256: a708f3f87f5239a79f5010e42db19775a6c16f50acb440613bfe0c7f6e8e4df1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable infrastructure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to solicit sensitive recovery information from the user. While no scripts were explicitly extracted, the presence of external links and the nature of the lure suggest a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://conexusinternational.com/ckfinder/userfiles/file/vamedanuxexe.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074491cec421---rilovunogufadadodevaneda.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/p5t1g8v6n1745e7icoabjkng82/55709644192.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d933e8cbe29ec03e52dbc9db102601ba/zuwefekepijenalope.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2751787c6dfb35cb3441759197618ff2/71478541711.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/duxituwuf.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/xofirujabuveba.pdfIn PDF document text
    • http://fgosvo.ru/files/files/84762846891.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/oavq6f79nvqs8lkaiknfkkh2qu/23247654144.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vch0vepfd2m1ljiinn00ujejcc/71836053496.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/janurimujitewabuvosomoz.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/morojefezure.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/29734827553.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/63421249309.pdfIn PDF document text
    • http://foodchemsino.com/d/files/16887303002.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6c26afd4f36839fa7b86819dc2d1ab4f/makavakas.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f72d27de6---lumokel.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd06e4086a---widijopulorejewev.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e003be7c---defuwereg.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/3296867206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=quectel+bg96+file_at_commands+manualPDF 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_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 19584 bytes
SHA-256: 0e11abb560df012f6953581b569e1673a436334e1eda19604cce3a1478c8975e
font_01_sfnt_off00013170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14987 11384 bytes
SHA-256: c11e36dfe14371ea5ba80ed69106aab24f323d64dc8badf3d373b13db38eb209

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