Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0821a0964661de5…

MALICIOUS

PDF

54.6 KB Created: 2021-09-05 08:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e1ec804a26be55ff844ab5dbc7efb5e SHA-1: c6d17879ac8f746cba564ba251a40040e528f245 SHA-256: a0821a0964661de52fbe85654b7acb8db70f77f9af8b2e242d0179bcd3ad9cbc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8155

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://coretry.ru/uplcv?utm_term=family+and+friends+3+testing+and+evaluation+book+download+pdf PDF link annotation
    • https://e-motorcycle.tw/upload/emotorcycle/files/24955628639.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/kowavoxut.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0e3ec5852---34530499859.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/suzawifot.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607671c735734---vozutatukuki.pdfIn PDF document text
    • https://melz-feu.ru/upload/nenubopafavutawapafodavu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42dd2ed263---43452132777.pdfIn PDF document text
    • http://gdgom.com/upload/file/210614191415290851tonh19gk2zlg.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/52785580430.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/titejuvaruridutanolumarew.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/44779143178.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/jiwuvesafigigikujuko.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c198973ffd4---ratetesupobumanekokip.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/rexipupafuvigozilujupa.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c56d4208d---18822971765.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/72886515963.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/sinopika.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210726_E8FE0C44E9985382.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/sogumojojusemof.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503152936440520.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ff333344013---wafebajudujewam.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/58122423639.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/66600534375.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/zepaw.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/47813345886.pdfIn PDF document text
    • 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_off0000bd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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