Malicious PDF — malware analysis report

Static analysis result for SHA-256 74354cf7069ae9e3…

MALICIOUS

PDF

47.5 KB Created: 2021-09-05 10:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9967e31dadb688e881eb832d5362b6e8 SHA-1: 631e4f90d89ccb17029ba1620ce8e7fb3e5faaa3 SHA-256: 74354cf7069ae9e30d891a888a973478f97a77d3d213ef3c091ae1bd3f74c2cb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and the nature of the URLs point towards an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7355

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 http://yieldpharm.com/upload/files/sunasemafizuwivekumipubal.pdf In PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/mexasezabite.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/48662786655.pdfIn PDF document text
    • http://huntland.hu/upload/file/35340575718.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/wotemunotifebewudam.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/laveralapevokanel.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210829014732.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5e86bb040d5b84e7b9f9181cf8b58bdf/94299697340.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607892788aafe---85169378354.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/78257264012.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/923e48b61f1eb3abee634cbb0838c532/rubawige.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/86f34ec7ffec5a177ba2c3774acf4722/delosunepadega.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/43387168300.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/51941195509.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/gumuluselef.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a23bd38c8---56659677873.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b8816545103---52367987385.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/df01f1203e2050b1a21f8ec47ac768dd/11626065822.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16126ce6ca23c2---sepijulifevo.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/vonusuzesexofazekaloli.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/lidariwujif.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c05ed27604d61c9ffe169c8b2632c48d/11693604312.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/a19999c80f838dfdf796b3dff1455753/64156264670.pdfIn PDF document text
    • http://kite-surf.sk/files/sasosubijaxudug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=water+purification+methods+at+home+pdfPDF link annotation

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