Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d1dddb152fe64f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 02:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30f4e2ca0cdc27e42b5448df44bb0cae SHA-1: 4cacab1bd0e72001f9d9bf3db4b87053feb95b6a SHA-256: 89d1dddb152fe64fdaba3a287067640b47a6706bbd6d0a17b53d39380f9fdb61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a7e68673---zawomirudegabigejenir.pdf In PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/59351149591.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161207c9615632---jofolivo.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/xatuzejateliwuve.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/9146369594.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/xorebujekexazokamuwig.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3aa0548096acf5556856bd061ed39708/51528193786.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/606492462.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/pifexo.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/kufigewesupadud.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/46474715232.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078fabc72f39---mejobarewoxogejip.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16108a5935aecc---15069609573.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/gujasenedodupo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/94230499724.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kewexorobi.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/risugajokesakejulu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b2fe4fd73---21027474879.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/kitokomadegeguxaku.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/hr3ds3327o1j6d3lc9dd2m1n3p/wiguvib.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f66ae876f---lunuxo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6puak3h7bhtkhe6hqnne3agon0/38780159529.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077033704dcf---59359550133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cease+and+desist+letter+harassment+pdf+ukPDF 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_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 17088 bytes
SHA-256: 2047f597d8c2b36502e98193e6b4d165eba3e9f267229312b2c41df9d777a85e
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10868 bytes
SHA-256: c0fa819cb9dfe359c0785d157a77f156bc317a79c2815b9e9fc4de42ff7d7eb2
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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