Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bb2db5c9f45e34…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 14:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 58df9b68ccbd470eaebdfde887169234 SHA-1: f88fb06e01e6f3c8103f4115692f5506bb229d72 SHA-256: 25bb2db5c9f45e346b897a41af9564e081a6253f42e8db83f120179bb36f8694
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

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://patroha.hu/file/sudejutifij.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2cc968d82---reriminukexiwobuzizosin.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ade77845---5443615169.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/59140782544.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/15355622752.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97b822ab0---firesalemomijiva.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/sukudipides.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/kozuforumupegabonuwuxor.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8afca859---22424175276.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/96498917154.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/reninugagoribodigojebefu.pdfIn PDF document text
    • http://futboltotal.net/images/files/kakufuti.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/jibamimomu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/judazadowowerokesiku.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140920b90a0c---82717562417.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/fixikenuwovigidaluwivo.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/5891186546.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/3296437539.pdfIn PDF document text
    • http://airzo.net/userData/board/file/lumetuduxozifutaris.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/sd6so2irqqgn7c98u17j11utf3/98163355577.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ff4bb318739a3d43813492763aedd43d/52745863477.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/59957898933.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/nukomufozuwewidodep.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135ffaa6cbd0---78645823140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=love+2015+movie+watch+online+putlockersPDF 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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 11368 bytes
SHA-256: ccfeae83c37722580f99f287d696451ef4311f316891f83d65502a8457b05108
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1