Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fef19c2e8801cd3…

MALICIOUS

PDF

62.5 KB Created: 2021-07-21 04:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21682b0081a6de932eb1ef28e6be7cab SHA-1: 909c304c8f6b06c85249a804511815db01efce6a SHA-256: 7fef19c2e8801cd35d47e38573b0b2f150e37b2e3b2281563790eb86437956af
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is likely used to redirect the user to external URLs. The PDF also functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. These elements strongly suggest a phishing or malware distribution attempt, with the embedded script likely initiating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5358

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079014951d03---67465673895.pdf In PDF document text
    • https://istanajp2.com/contents//files/48372617170.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/1526435384.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9602b304079386bedcd998ce7fac8803/surafenitipidum.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/cledjmkjcvo4l9m1vi0fa573nk/toselixifomudagajinupo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8f2f5c21b---30123080396.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/19244039909.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119fccb364.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/jilabukajor.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/6436536677.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8720e8c40e---58179809110.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/fimurulokolagawesirunusow.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc07bcfb2---20983033695.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e8fe49f336761f53be5a54a499cc2250/funuxubufazurupetarodugu.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/86738014011.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/5bdb0d16adabfffd7b9f9fdf1874b06d/36207368301.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/86327238224.pdfIn PDF document text
    • http://stasta.com/userfiles/file/bupelodene.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/gezubebuvuji.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d6ff77af8c1b6eea763ec10e361448bd/buxunuv.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/92480195141.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/080rhnkccdqjnk2a5nnrlpv11j/84808414712.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/beliduvobefurame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=baby+girl+name+by+jPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ac52dee77521273fbf97ad0ff997778/31307598121.pdfIn PDF document text

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