Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcee7504c30a70d5…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 13:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f57ec1e928f0bbed7b50234f3da8679b SHA-1: 41089465e1e23295839d3a7e7a851de419bef0d6 SHA-256: fcee7504c30a70d5b2984f4b384dd5ce8b63c232961c030d29a723db21db3a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting sites, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document used as an initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://jyotiacademicpress.org/uploads/file/mabiravobufapixog.pdf In PDF document text
    • http://tfh-filter.hu/_user/file/22182730251.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/taputufizubilaki.pdfIn PDF document text
    • https://anaksemut.com/contents/files/32495966716.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/85787430283.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21620373594.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/66803164098.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/82625852055.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfa06d1160---17872956868.pdfIn PDF document text
    • https://lorus.rs/files/16162309097.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/37093013205.pdfIn PDF document text
    • https://rcot.org/userfiles/file/17661497178.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/74438218133.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/96215504712.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/03e87c74cbe125a2be113771cb9bedae/pizux.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/90568768940.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xemizanededemal.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vokuzanejaroxapimiza.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631873749.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/55113669437.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131098b40bc5---55496422779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=atomic+size+of+boronPDF 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_off0000c0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 10468 bytes
SHA-256: 070be5e9f2b2b29c984c1c2ff046f32f068218494ba5d0b4d20b5e7abb0cd49f
font_02_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 17964 bytes
SHA-256: 02177dccc109d84c60c68fee452d90438aac5aba3ae024e641616983bc780070