Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d495871fdb20255…

MALICIOUS

PDF

72.1 KB Created: 2021-07-19 08:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5bab7089349bba748f88d1e3a2a2d53 SHA-1: 6888fea4cffc960bc843822d11f0627f00ad7cf2 SHA-256: 8d495871fdb20255bf2327f1afa48f5b30fb9fc03dd5930096f38c591c635af2
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a distribution mechanism for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6717

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 https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077de2eeb72a---23788559362.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/jinajunol.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074544d5b3cd---65197719548.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc1157f39---14238860873.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dqk3jf45c2m48gs5dlli5obgg3/428557525.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d358b4e7aa8---14204806844.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2305de1de6---16838149669.pdf
    • http://beulahcooleycollection.com/clients/870349/File/romikuzonuxifazibezatered.pdf
    • http://quaretti.it/userfiles/files/lisedezix.pdf
    • http://pogservice.ru/userfiles/file/xufesotar.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7bec2dfc481d819826ae32c468f7f7c9/mobozinujejaw.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702ff4d0178---98985144730.pdf
    • http://aplus.to/userfiles/file/18680935618.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tidufojubijonunumokomowo.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/wejenisikodexo.pdf
    • http://gerd-pollak.de/userfiles/file/wizutifijuzotixetoroxen.pdf
    • https://giolog.biz/images/bulk_images/files/kejetamenuvitupero.pdf
    • http://auto-spec.ca/fck/file/7062519391.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2d4267c2---6148455656.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3861113cda---50791134500.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e36e6f1acc---miliwinewifetaxewi.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84796659613.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/673b22ab6c3b6e7a63a066a47fb68513/pixexigeso.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0cf3ac858---2690757488.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=substring+javascript+example
    • 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_off0000fc7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 16792 bytes

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