Malicious PDF — malware analysis report

Static analysis result for SHA-256 b302715b4dad6b23…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 13:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1a855a92409fb76af3e33d334903b6f SHA-1: 1f59cdcb7bb5ed9e7207a2d58c7f7917b84caa9f SHA-256: b302715b4dad6b23fab79d3a93e1cf6c8763968e22274f189be769772d8c6a02
236 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to various compromised websites and potentially malicious files. Notably, the document employs social engineering tactics, specifically a 'ClickFix' lure, instructing the user to copy and paste commands into their system's terminal to bypass security measures. This suggests an attempt to trick the user into executing arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pistant.ru/uplcv?utm_term=windows+for+chromebook+installation+helper PDF link annotation
    • https://viettincapital.vn/upload/files/91970304025.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/46499331481.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/72532613885.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/kurakitirexiperudelijis.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6eb4131838055cb6273a01fb6f40ff4e/miporuf.pdfIn PDF document text
    • http://samtekelektrik.com/files/84863608931.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/bujivonurunuwoxa.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/zusutowilewomimedav.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/pakenenuwi.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/51599913584.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/nixojozin.pdfIn PDF document text
    • https://penal-garazh.ru/files/36090519387.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/70475278330.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/kusep.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/panapedagevu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1fd0fec3c5eaf65c7b4b8cfadaab155/basikosibagidu.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/12218922004.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384721c2b75---zowotu.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/930550968.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/gufuwosugutuvajerolita.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109052329296551.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e245b1d1b869d924c5030b167e3db5df/nifip.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/kikoduduzuvugapazexema.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/2067620099.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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 18744 bytes
SHA-256: 710b4ba7a3861a583dfb4a90c90805a8594594b496896734075562730587efe2
font_01_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 11196 bytes
SHA-256: c94f7e7f73c9f098c3c89f3a8d44f4fac4c158df15c3558333bc4f3b4808f66e
font_02_sfnt_off00012a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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