Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bd2b0d3d4151bb…

MALICIOUS

PDF

94.8 KB Created: 2021-06-21 13:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 481a637062e66b13c60fc3a5ffecfd26 SHA-1: 9ae9c95652f72c180a106edbf77a87bd93644ada SHA-256: 15bd2b0d3d4151bb03f28530f3b93746949d03c6a81e1e0b35b56a9d289e8380
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://oniceh.ru/uplcv?utm_term=catherine+lore+era+of+chaos PDF link annotation
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f22bb275b7daf226f1af26c3aa938a94/70701537113.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f279a085---madisegex.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b7339939---12651679935.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/20552655083.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/18d44cf86d5b6acd1dfd0e7cdcf180bd/vuravilo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9f313fb0---48368759485.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/915aa39e153129746b324af0ea81cb96/94426514569.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/12222483728.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/nanekowizafixawogomavafok.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lebovo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19d3b0a676---90320369366.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/74d5e1acc962a02adf610dd482e0d8a2/18401222848.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/95889312665.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c3661a7c---tagusupaxekiwumolo.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3e5559a9057c2919587eb230f4e05a9d/81134482849.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/62dd822f4eae6aea18f97c027870148b/96449332361.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 4876 bytes
SHA-256: ec46c039a873b33f0cfd261d109dfb060e94456aa585b56fa9fdc2f2048b089f
font_01_sfnt_off000146dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DC 11128 bytes
SHA-256: feed09ad283f71d0272dd80f94bab1674ba4b67b27ff73b201196eeb27374364