Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4c8c815d3cf4fd…

MALICIOUS

PDF

50.8 KB Created: 2021-09-06 15:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6a54061dd572932493673bed783996c SHA-1: 37c0cee25cb5f2597f1bcc35e89a547cabec5092 SHA-256: 3c4c8c815d3cf4fd0f00e24b72f11f7ced74d10140573873a031f76dfbc35f6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7448

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://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d606c3a82a---nodunedutufus.pdf In PDF document text
    • https://iwanbim.com/userfiles/files/30675603143.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108091853376475.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/46982044424.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/23065721213.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/58683890469.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vlkdptjd5refo4kofavg2l56h3/pinobepekagevoketigoves.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/14913711259.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/30389054040.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/46430692692.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/62072344030.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/09898be15f20fc612209230b37dea3ed/vagosodukaguronu.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/bekumesonofoxukozokatil.pdfIn PDF document text
    • https://ka-base.no/images_content/file/dinugaxabominogijinaru.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106030911337325.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a35699c70d0---sopivuno.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb6e53655c---wipoxusavaveg.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/67fe4670d815189eca2e355b2093e113/81400616146.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/97254c407c01728fec8ac52f50275b98/bezalexafirazugako.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/75910977878.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/todidam.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/woruxefasidalefurilik.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/muxur.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612719fe410d3---57172423311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=colours+worksheets+for+grade+1PDF link annotation

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