Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c92425dbac2dff2…

MALICIOUS

PDF

63.7 KB Created: 2021-06-10 11:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6f52b43c842c2d0eebfe706496ed873a SHA-1: 8b7d75ef5182ee24409a8be82cbeb5da3e17db55 SHA-256: 9c92425dbac2dff2dddc6054cc51e646ca04620b0e59957b11868320014998c7
174 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=nelson+math+textbook+grade+8+pdf PDF link annotation
    • http://gtshotel.it/images/file/62399900760.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/mejuwunuriseroj.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/88000029131.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160718cf3dcb85---87310146381.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606e5cb99a235---50465776148.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/8373436074.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664cd9508b---vonil.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/96317910685.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/rurosijolexo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8bb27d2ff---bokazemiwerigoloxuxufutem.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/16678854267.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b7585ba577e---2632787192.pdfPDF link annotation
    • http://jngf.cn/files/file/3718710486.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c679aa60bd7e05d2b49c62fb0b2507b9/vozigesedu.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/50164001501.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ur7l1075mpla3d73k7aigdeldm/pakosupunifoma.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/lepifenog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 5892 bytes
SHA-256: ab7060c13f1c7abc420d7e3fbbdd0a2cf581dd0421188310be7c4f430bedab20

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