Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d39437810c708a5…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 02:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 222e9772b27264a3c7d51750724ecac9 SHA-1: fe6a0bd1775b5aa69248b6759507e8e23ea6573e SHA-256: 4d39437810c708a59a0eac35cc6dfac407ed2e1e06f458090e25bf1e1f061775
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to lure users into downloading files, disguised as popular content. Several heuristics indicate the PDF is part of a link farm, with many links pointing to disposable or compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be974330b12---rogiludubepivamufave.pdf In PDF document text
    • http://robalton.es/Albums/images/file///46274596393.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/66576289861.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/tozugifok.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feleselatu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2bfc741bfa0ba5cf4a9a50ab1ba21e56/75850440353.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160902818a5f7f---ruxotolunegevukilevid.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///vuvovabiwel.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8293b9d322---vozirexitukekomutem.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609231f620475---rigijilu.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/guraxewopodedaxunomufu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608915a4df574---19088784267.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/19294648262.pdfIn PDF document text
    • https://nasselgrundet.se/anvandarbilder/156/files/juvatijapulivavekitu.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/26440352199.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16098e036c25a6---27862991975.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/xiteladoluvutimopemajo.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/sagiginepedi.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/38061373461.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/93807373497.pdfIn PDF document text
    • https://123natura.com/stockages/files/28296162403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=anna+and+the+french+kiss+book+pdf+downloadPDF 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_off0000c067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 11016 bytes
SHA-256: 583cf39e3fa9470653899beb54f6efc4c9c509bb6318d848f74965d552f28fc9
font_02_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 17080 bytes
SHA-256: 23968060b48e205e201196e77d8996bdd4c9a37fe75ab6273cecb4bee0c370a4

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