Malicious PDF — malware analysis report

Static analysis result for SHA-256 476b934bc270a7c8…

MALICIOUS

PDF

62.5 KB Created: 2021-09-02 16:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42dccd9ba744cb09054fb9bfb6391896 SHA-1: 5daa8a2972109f9ca43b6be8cd90c324599ee90e SHA-256: 476b934bc270a7c8e742997e91c56ebfc2f37946bdf7d76c22007bad78deb23c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination and leverage compromised infrastructure. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9100

Heuristics 5

  • 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.
  • 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 https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d6aa2cdb708c52e55d06d6929ca5cd93/xawedudovudejidigalubin.pdf In PDF document text
    • http://cobmedia.hu/include/12353456029.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/bea0f0215f1e3d5b6f66605417ca8a43/68036801450.pdfIn PDF document text
    • http://ktcz.eu/files/files/vagamevokoribela.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/rivowaralu.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/21100487623.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a7381067---dujivum.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/89182789262.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/59763539268.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b502c0440---zotofabiwo.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/xubimoworejobil.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/uvlffupkr50m282q4n31qig1mj/22937083541.pdfIn PDF document text
    • https://btegypt.com/file/95607064704.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e7e6f1f79a76e24b83a1401ee9adfe57/refodekesukowosave.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/35690694481.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uadd9n2hm3kvarelg3g8041ner/96304386691.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/f9t89h0nm9edjqqfmml7rhlo2o/10949858394.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/17844896927.pdfIn PDF document text
    • https://safecampus.in/cmsCart//upload/file/4265214170.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608551ccd4bfa---togufapupinotapavudomisag.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/84526995396.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/eim6ga6cnb4hqdoorouurvqof7/92725427640.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/kawizerefiderazudu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ef0f8rcdiphheuh8rjiilrd0a5/98809322325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=excel+mail+merge+to+fillable+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 17240 bytes
SHA-256: 3595772188b9e994c00283663477c3471b64b7e3862106e6e8580f6f976623b4