Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9b6671c3c11afb…

MALICIOUS

PDF

82.7 KB Created: 2021-08-31 00:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48836d900e335c80254f27d5a287d8ca SHA-1: e0aba71255e3f52498babaa5bc629d9a89e948b4 SHA-256: 8b9b6671c3c11afb83c0f1e58445acdfbbe4fab49e493460dd3f9a712da042a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=inside+a+solenoid+the+magnetic+field PDF link annotation
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7nesbmvt55tifmafise9buuio1/85449476412.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/92126091475.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e0fc80a34d3b4fabe605de1c07df44a7/54844588613.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/naxake.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/2590566137.pdfIn PDF document text
    • http://kaies.cn/upfiles/2107230534394419606dwt8s.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c1ba9067---bufogebataro.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/34796460ddb85b695b5c7e81746285a4/jedamulekutagimajofuve.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/s5bqmqds4mohf4ti44qqbfqop5/42574622325.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5otgksdlcde2ocjoacg2uk6ce7/31724316220.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/35690412362.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108062328207358.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/rs4b1llq6kphlvcmhsp1ovseoo/48511556359.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/mumaxowupisoso.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/95352390962.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/9029325490.pdfIn PDF document text
    • https://ienter.bg/files/35514173712.pdfIn PDF document text
    • http://huefpdf.org/upload/file/88461114611.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89d60d448---79946608262.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/37229310585.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c03ea7c19ed99a0937afb67ab6a99b22/kaxawinukotegonuxosi.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/25012964952.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/vimulovaramulunin.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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 10772 bytes
SHA-256: a6fcb0ee5368b3af787403d48fd9c26ea97afce7b372e18226c1ba38c1842d9e
font_02_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 17668 bytes
SHA-256: 1d9c204fe6c0d987418adf415ea032367b6009980df18580b38cab687427a503

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