Malicious PDF — malware analysis report

Static analysis result for SHA-256 737a3a0d3561aa79…

MALICIOUS

PDF

64.3 KB Created: 2021-09-05 09:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: d96c3401659c47d4e9f957640c3e9cae SHA-1: 2c7187a8cd6e2f067b44658cfcd43f6f60e48142 SHA-256: 737a3a0d3561aa797f92ddc865296a345b79ed20a8bce015d374c521b50eae9d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

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://atomleasing.ru/media/File/nubepuwide.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d7893c6f56bc6adb6792aa99550b34a3/vaxenufibaraxubipigibujaw.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607299389f462---jibiduzifitivefelabu.pdfIn PDF document text
    • http://banquat.com/userfiles/files/45819845378.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e912561968---waxiwogazejaxalakusovi.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/dovofugalopo.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/kazufu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f62303f4---deruniligigipazimelawo.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/ravuxoforasajegozamoviz.pdfIn PDF document text
    • http://woykoff.hu/upload/file/99097213517.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/dsl132mv1hhpc75msrqoqld3l4/11918004969.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e09a746b79ca2404036d77ca28d1d8e1/valalinapefudusiwefir.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/23829187220.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/geripipujef.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/57309212446.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d659891f38---danokodatepezur.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915266d1863---nonawifalukulonirubepemu.pdfIn PDF document text
    • http://fskyok.com//uploadfile/files/guzafeporokedejubowo.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/5367417219.pdfIn PDF document text
    • https://rais.bg/uploads/file/44467837894.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/34638613130.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/masuguvetonirujub.pdfIn PDF document text
    • https://basisangka.com/contents//files/55774358388.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e47bfcc55bb0c11f6769cbd13dcd2c2d/52418514490.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/vigirujuwedatoseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fiche+processus+ressources+humaines+pdfPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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