Malicious PDF — malware analysis report

Static analysis result for SHA-256 9957704e9736c8ce…

MALICIOUS

PDF

89.6 KB Created: 2021-07-08 00:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4aac0eca5760fc0f7304c6e064048e72 SHA-1: 791f8f01e805d229dd27b00029fc82fb25c5d6aa SHA-256: 9957704e9736c8ce073d1887d78bba2b0441c823b5efc6d17bfd0f02412e3354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised CMS upload directories. The primary purpose appears to be directing users to malicious content hosted on these compromised sites, likely for further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://55thocscompany.com/clients/62662/File/7069064351.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c2a0172d3b7a18d1c5559b0328dc7cb6/31562783158.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608938173db08---pumenelugunizewegob.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/4001701746.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4af9c385a59b4d126e06e753000f9fd0/42033836692.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/51410584796.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609107a7a7bbc---18291085341.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6fb1164a---vimokivo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca01812ff87---posogazerapali.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/73652979444.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/46952113906.pdfIn PDF document text
    • http://fygl.net/uploads/file/091902394368.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/zexigisis.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/94361135556.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bad02a99---zatuzuwipopuzipaful.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/24608069525.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/20oa0o30jgtsgorubbpm789t0b/fifefekonepiwizu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/25813933649.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/932a25207a93759e1af914ef434e17c6/29259334737.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/5777917880.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7325e2376---kanupiripepenupewebi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aae5341e5---33649904298.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/riwobekodigivisazutepagun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=using+visual+basic+in+excelPDF 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_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 10500 bytes
SHA-256: b9f486f9e59910a1195f66357c611d545d4860ffbe68fa007dcdaf03722fc752
font_01_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 18896 bytes
SHA-256: 85209bf2874f36aa3478b5ea15b8769a64539d44beb2a0f8cc6263d9c6b65b45
font_02_sfnt_off0001417c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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