Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5db58a46a87684…

MALICIOUS

PDF

89.9 KB Created: 2021-08-06 06:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2b04bc200e92bce8d81b4e6157e1bcc5 SHA-1: c3b8276c8abb35d343f69ebfcb5a41a7e43273ad SHA-256: 4f5db58a46a876842ad99a4a09e21f5b1488311c98eaee5adcfb2f57c07c1f2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16278469344649.pdf In PDF document text
    • http://studiozammuner.eu/userfiles/files/tasowireremoferopexepib.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16256152061964449367.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/m4qdnfalheumvslf05noufskt5/gaxazezoxodi.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/56471300419.pdfIn PDF document text
    • https://network-italia.com/file/48232286822.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098d32c061e5---12064594480.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j6h3u5p02bpivnf7mf6ti317l2/81720611056.pdfIn PDF document text
    • https://cargotavio.ru/files/file/lidol.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c56187ce2---68936864014.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/36594383732.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6579a97b016f192f4c2964748482995/70043792849.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/e3tv36va02i74voiak8nc3fa2q/sazirizojuxigitimusumok.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e5beb9b8be25845d4030fb80c77c6243/wemiwasinavitetavinuma.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/43414366627.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210610202625570.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/jodiwuje.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/relofe.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/5483962296.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbb574872d---31474087844.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/ronotebawo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048d490fb5f---xezofirofepekefexovutex.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160867ea8ac1b9---98470198510.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/gotap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+calculate+interest+and+maturity+valuePDF 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_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 17488 bytes
SHA-256: 912f9ce410ed7ad45c88d5714cfbbba6d9d155701ca55eacb8ecd6126956582f
font_01_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 10888 bytes
SHA-256: 275f070d7a1ff6e6ef150897ab2d54f876b2ea55d172aafa6e08058266ebb841
font_02_sfnt_off00014064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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