Malicious PDF — malware analysis report

Static analysis result for SHA-256 f320f74160a649b3…

MALICIOUS

PDF

72.0 KB Created: 2021-07-07 14:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4203bea1d677c3e5958398316308c69f SHA-1: df3d8d37c97b9cc80350497ff53e2d5331132001 SHA-256: f320f74160a649b3c84ff05c021b2beda864b2a364421001b60e1a2e3fb22d90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7819

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 http://okmarin.ru/userfiles/file/68078671446.pdf In PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/pobolupabuzakutexekosole.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/98749283141.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/81433260614.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb9af65486---lobof.pdfIn PDF document text
    • http://imi.vc/upload/files/85017259260.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3b528bcfa4a09d3bf2dc405feb7a4dff/jukobitururagi.pdfIn PDF document text
    • http://metallpress.ru/files/porozegovoxejulodivebiw.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0gsqqb5s4ekktic9ue40ctf2e2/baxel.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/35898508342.pdfIn PDF document text
    • https://dietacud.eu/upload/file/37116207572.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160787f73901d5---daxavivire.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/42c705035d657c256ad118d414bf9116/nixal.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/af071cd2ef2070963e0f1286cbeab98e/42922414675.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/87463378634.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079674915e94---kekegifeterav.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/gevezulapiwakefun.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1601350e7b55e6f2a0f8b9fb8a1921aa/pewezopojiporisoned.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/rarijexobalarunikakorawi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/aeabef2e675ff0445a73ad01fed450fb/wolirudalodetepenuzepelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=100tg+day+of+schoolPDF 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_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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