Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec935835acf7481…

MALICIOUS

PDF

70.3 KB Created: 2021-09-03 08:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bed55ecaff832908772103c9869ec95c SHA-1: 88431f62ee39664db97c2a36a4d179306e6e22aa SHA-256: 5ec935835acf748114e200558974e28616dfbbc1c3ccbb32b1092ae8d89c862c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm for SEO manipulation or phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6736

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe85a26341---demenip.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16104b5e96c54e---bavejawukepotowo.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/47135680666.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/61669040217.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac48347d3---1959713661.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/28947865709.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1109cf8a1adb07feab0f675543e8d0ec/8189549277.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/gepapibevitoli.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/70391008286.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/27593374837.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb96a870a---62973671689.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/70103916786.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kafotefis.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ab409a2f---92809835844.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/sofomef.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/xabejonofar.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/77462868530.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/jijomuxotetodujuv.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/89418697747.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/19642044928.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/ce0c1e36d86e30710ac4109a59f1abb8/5996342836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=2004+honda+recon+250+repair+manualPDF 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_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 10968 bytes
SHA-256: a78aecad758cf5563fb748f647c5f2a0ac05ae271c4bb80a907abcdef5736197

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