Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a5de5ce3066e81…

MALICIOUS

PDF

72.8 KB Created: 2021-07-14 06:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ea16bd9c1f3959cb0352186d8414412 SHA-1: 06dcbf3fd8a87aeb9b249891d3faa6663ff203f4 SHA-256: 56a5de5ce3066e819e1c6a1e7df1cc1017ddd659d12edd4f46f933d7eed9b466
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly imply an attempt to exploit users via malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=connotation+of+hobby PDF link annotation
    • http://lakes77.com/clients/47041/File/momas.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d8335191425f90ca1c619b27cc4cdd85/fakitad.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/sobuxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2f33b781---13778342482.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/17606386261.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a32542ea74f---xegetujigitetopogan.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/gbevjdhfjkrnbjt8i1e1sd99h4/zitexivofaxenewekowezu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16098b49b9872b---gipowovazeguna.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/fidomovuxuwufa.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/92563285644.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/wikiguf.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/banazuropinujobujagopuzeg.pdfIn PDF document text
    • http://aven.su/userfiles/file/2301164469.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc604b388---50679605057.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b30b8f27592b8d08631c1457fec29f76/jesadopiwuvimozolujav.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4413f4aeb9a3eeed2a0e681de5165461/38745849042.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608391c7183fa---jefuripisivisofobaxawor.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ql5igd1eut7vk6mfajgihtbqed/degosoxonupezevi.pdfIn PDF document text
    • http://salkim.com/userfiles/file/65982641225.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/uma1c5bl2bucuc3vsq7l5hu4a1/82162947483.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608321c8d2313---kevurebekekunavitowo.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/vomizos.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ec0c6b961---fowevibudafivoloxuletos.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/vusurusodavebuna.pdfIn 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://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_off0000b979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 16952 bytes
SHA-256: 7784ec87b964b4c2569c3add142d43d6423559d416d0fba0a07a43e52f53f1e0
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 10152 bytes
SHA-256: 1b68a4ebf79ada9a4b5320dea2e73a07e87387a96bb01b8f17d04df49774f81a

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