Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf96be14b6106c5d…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 07:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 33310ce23d2007c5dd5cbd6e8ebe0509 SHA-1: e4e6c69edb5a1223d9cbc02a927b3512fae62082 SHA-256: bf96be14b6106c5d7694bc9cd6583043c10d17f61598d235b68ff5d32b19ef94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV both strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting a tactic to distribute malicious content or redirect users to phishing pages. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a191b230---77171327778.pdf In PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/tesobefoguva.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7a1f66275f2d1d11d3e7e4949e25a924/72600906282.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/pojisabejosimije.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160819cc60266b---padolatezomanunobe.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/zowozukajagakujor.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5neb1hqakhulmgj9gtfp372h1v/11688992395.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/33487602987.pdfIn PDF document text
    • https://btegypt.com/file/nutogibesufa.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/xunonifedezirilojem.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/75e86k47ldi3suk68hcrtraumm/tuduluxosutedatomadiren.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609921e0dad80---kazuriwunikugesaji.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9379fbfe2427e6b4ff026a6cc0dbd83e/tivugawo.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3s0soi2qglfp9n9bkm73oo0jaj/gaxesisowanivex.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/594bdb366486ae8ef5ba33275814bff4/97259474752.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d591776c1664375ca17575fb1bdd154/leluv.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/mupojirolivifejesuz.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9abcd6f8d---44059533516.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df0f299352---45917079954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bookish+and+the+beastPDF 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_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 17448 bytes
SHA-256: 5b8efa9414f4b56c750629e6537ea256b6fd8aa5291a8edcbf8f47fcae59f0f3
font_02_sfnt_off00013eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB3 10484 bytes
SHA-256: f5fcb381987b1780239bb11f632a1b45af0a826c0bf3e15a589e11914c49bdb7

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