Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cc3825892f219a…

MALICIOUS

PDF

165.0 KB Created: 2021-06-11 10:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6a8851bf1ba21bf5262ea05afecdcbbb SHA-1: c83e864fa46338c11249c8889b430ea9a926ee5d SHA-256: 39cc3825892f219ad647d46a46af832dde69a43c47ea5867adc7cecf9ff0337b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ketchas.ru/uplcv?utm_term=adventure+journey+pokemon+game PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59818a1ba3---basizebaxupoboluwova.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/d9u6if8jhqeqrkj8i3gqecaf12/rusewagojigidew.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8fbfdd0866268d3453f6536d92bf8f3d/86277262441.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160701afd2ce48---pabudutujexijeni.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/9759267396.pdfIn PDF document text
    • http://tfforming.ru/d/files/30532068138.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8f264cc8---4692098621.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/pajepebemoj.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aad6af082---zakuvesodufimis.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f427d793cf---80904279150.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4980b9d767449e2271201bd8ffc72265/44751230906.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/4795828828.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/56a065047952c66ef6d95ed4b0efab8b/73028305891.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2cf1gjqg0ntohbkngqov6gdjg6/bowitunajorivinofi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/bugagaxibivajesiresozili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B676 39772 bytes
SHA-256: 05f88641bf1ce406195867b591d3b24d75050147febb4988d68e30a3cbe40571
font_01_sfnt_off000230b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x230B9 5360 bytes
SHA-256: 702cd5ded46478b5fd64da5892bbe252ad1f93a2e0b867a8a4c407d41e969627
font_02_sfnt_off000242f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x242F6 13992 bytes
SHA-256: 1b2fb22cf3ea074ceb898afd2d3e2f575f82b43b50dacc509c5c306399b48aaa
font_03_sfnt_off000270bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x270BC 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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