Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a8e602fd3ab1f9…

MALICIOUS

PDF

93.8 KB Created: 2021-07-26 15:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12b69306fa44aff63dadc20d158da0b9 SHA-1: 232db4c6ab71c4c37966692fc6470e07980bf693 SHA-256: 28a8e602fd3ab1f9df681a73afcf19dfae76abc220b364fb899c66142109c313
236 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It employs social engineering tactics, specifically a 'Clipboard command execution lure' and a 'Browser installation lure', to trick users into performing actions that could lead to malware execution. The document also contains numerous links to external PDFs hosted on compromised CMS uploads and disposable hosting, suggesting a link farm or distribution mechanism for malicious content. No scripts were extracted, but the overall pattern indicates a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://valserve.in/web/k/main_admin/ckfinder/userfiles/files/zonakomi.pdf In PDF document text
    • http://barcabianca.eu/upload/file/punubenade.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/joribato.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/godajepavekujerefesir.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ac6e0d1a1395f155397ac2a95771da08/13033481876.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/14736742618.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/tamejeterilu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac077e10eb0---tamarurosarojik.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/89599757175.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/23868209920.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/pok41c7a7v9c9hntfo0oc28s10/9653573177.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/854f1f69c0703da6a9fc98d0ea9df14b/45823498162.pdfIn PDF document text
    • http://babamoleskine.com/files/file/30661424123.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/49159263586.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/sosujaresi.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/fee37c698a35024246e1d35c8afdb6a3/mixuraxogodaxiwuv.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b217b9c41a4---fukonofatufigo.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/dejowoxomowolikoxafuvu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdfIn PDF document text
    • https://termofriz.rs//files/vosuzuvuledubi.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/de571e3502628643ee46bfcec8dc025e/3248205771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chromium+os+image+filePDF 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_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 18780 bytes
SHA-256: 7ace3a52836ac616f3c98daf4c49045aae26b3b1f96aaf5038599cc3d9294228
font_01_sfnt_off000139e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F8 10588 bytes
SHA-256: 8184153576980cc90702011280ecce445460a974941f67b1d2888db9d066b483

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