Malicious PDF — malware analysis report

Static analysis result for SHA-256 f464a8bd3ffe0a05…

MALICIOUS

PDF

70.3 KB Created: 2021-09-03 16:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df718cbf8c5a0224c335944ae953d9f0 SHA-1: 90363a1bf360307d0a1077584de0afe89302d428 SHA-256: f464a8bd3ffe0a050ecf588bf68b6fd3d96b6bc0f6777209fb02e614562569e9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and multiple external URIs pointing to what appear to be compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8881

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.
  • 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
  • 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://luatsugiadinhviet.com/upload/ck/files/35756165623.pdf In PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/soxexonesadakolisake.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d98c6299c---soxibukeriz.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3b294852b872a16e6ea03cb0221c2f47/72250182683.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffa7b177d---nojud.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5270519d09e0f5455ace6f1f930d6458/tovevutofivogoguf.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5eb03bafcd6891a16150b232e008cf90/jisorefiwipiwu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d977683b---pafuseminoropevikesaj.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/84071676962.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0eh8f3ib7ki491ch2dnskcu064/74945173021.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/zakafow.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/fuxitufi.pdfIn PDF document text
    • https://brod-plovdiv.com/images/85105984992.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/59426730627.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/40645139657.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/eci0hshu22m8c44j2q8j3np8mk/55853268766.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967b2ac27a9---fusefifure.pdfIn PDF document text
    • https://iword.de/userfiles/file/viperidefejowi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607690c2baa96---77565757290.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/337cad06dd16108473638aaa651a1ba4/sifagubirekokuvaj.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/43070851498.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77cb8afa5---95902067296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=toyota+auris+2010+manual+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 11000 bytes
SHA-256: 011e97f0ea1d280712049fe837316272e4f06e98927c7c0240ebc0e41428f238