Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd47d99dd4fcc89…

MALICIOUS

PDF

98.7 KB Created: 2021-09-05 05:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 553632864b30b4cabe2acc724f5b1114 SHA-1: 01e203ce1fd042c0201d165bc85f31a79f3e9ab1 SHA-256: dfd47d99dd4fcc8959ab2fd8975a5225837f9a9085aead3dc487c0900c018af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/jabagetijeriwewofo.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd97621ee---rasobezibefax.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/n5r6ik66kt8ag0aobv96utqs02/58095529347.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f9912015---61173870076.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f77f69fa5---33115213078.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/vvqg0gupb4e2bon6anl1b2eii0/biseti.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/1131826263.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/97d016f9c583c8ce4d6464137030dca9/85576259969.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/spfgjafldt108ivf5gakdtqvbq/13574630288.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/xogujinetisujoj.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a2241c28---vazetiwifirusi.pdfIn PDF document text
    • http://prmakeup.com/Image/files/77881421026.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/xiritaxakoxagowo.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/3079634623.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160923be8c5140---solezimekikefabawometelos.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cce6d9e36---31180020113.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2e4c45f4140ca618f7474c43e61513e7/79824196689.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kogeda.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b8762bb48.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5e57dae3df3684ac07ad320ba1a18d26/debimasobikovamusemuve.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5252b60556b7561e0159b90db4fa86cb/54828121579.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/tegevulijuzo.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/25905317722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cyber+law+pdf+in+marathiPDF 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_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 10848 bytes
SHA-256: f2672ac6d17e98aa5a0fea8c44d932b8ecad24c80c632f63c1361d5e020719a0
font_01_sfnt_off0001354c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5E 18336 bytes
SHA-256: 0a3a22cf927541155f75004aa5137c3c5308411ceccaea931d3335a66902fd05

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