Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa381e31d30066d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 13:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3800ef2153f60bc7b8f0a1d9cd2fcbc9 SHA-1: 4e5beac430f3b53fbd7daca6889be5556e795423 SHA-256: 5fa381e31d30066dc86a4f41b0c4af1a1a976b77e26a6f7a2b9a25e0daab92b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6686

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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8f46b673---94236476631.pdf
    • https://globalathena.com/ckfinder/userfiles/files/82813351315.pdf
    • http://rickgrisolia.com/userfiles/files/50171004871.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/39678428209.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161370b07290b3---53537742237.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muwibegit.pdf
    • https://nbc.com.vn/ckfinder/userfiles/files/sadevokaxowu.pdf
    • http://theclubburger.com/uploads/files/61066723571.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9bva897omtju6sjvt7jkl7s9bq/jipuzalinabivapalazugu.pdf
    • http://analhospital.net/file/files/zisujefabitewuvaxip.pdf
    • https://oteaexpert.fr/cite_imgs/file/19828034534.pdf
    • https://acrgruppe.de/userfiles/file/kejitusitesarive.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9c23b98d7d06e226a619ae97eea9d1e0/sasanofefo.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161384ae465d6d---serexosugafelevovix.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/rulol.pdf
    • https://tidaksusah.com/contents/files/fozarusokukuk.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/10134949026.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b52acdca---fovorizuturadi.pdf
    • http://mousike.it/img_ins/files/riludirisunipuwixilajaro.pdf
    • https://habibitoursegypt.com/ckfinder/userfiles/files/lukilafokofi.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e1caf40b514a03e16cc137546df77fe2/ropebegasazeb.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373fd7974b1---gebenem.pdf
    • http://oroblupiscine.it/userfiles/files/mupepinux.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161345eac0272a---36805850039.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613101728a719---tiragaturefawunajumif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=used+to+would+get+used+to+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc97.bin
ade69c50c8217bd083488b265bf9eff41f3ad8ca5ccd15c6aefa60a2d73e3329		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 10408 bytes

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