Malicious PDF — malware analysis report

Static analysis result for SHA-256 3883bd3790cd1d28…

MALICIOUS

PDF

69.9 KB Created: 2021-06-25 09:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 40d7d14835548126a543a24c054a3b1b SHA-1: 8de67a283d58b4e860960bd20eecc5d9d5b3b6b8 SHA-256: 3883bd3790cd1d280a5aadfd01f9b3fcac1c82e913e59ed2467321dcecb2f257
156 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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
  • 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://cructi.ru/uplcv?utm_term=create+pdf+in+preview PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cc753891---febud.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/livomagaj.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/finifiwofonuwakupovibin.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/1dd336i90223n3e2dohjnja0dd/niteramokuvurapob.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/inh6g623m17v5bcv6ggtujecg7/wuxevinotefixasizuboxedar.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/kebepivibubojodatabefew.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ro3jocu9amgg59r6h9ajhptc2p/jowewaj.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/webalagagop.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/9tj7460olpil7thg2n1jgrdjqb/kofowofofumana.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/xobenojazulosozexari.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4718a951---vaguperixovimazoxim.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a903352ef---nuwujufotamanamunejisonaz.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/xugovimokotirune.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8cfeb4a5e401571a42c222b6f9042229/8495041964.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811efcd5ad8---gupomo.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wojenikumanewaxijota.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_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 4884 bytes
SHA-256: c3b3895264ed97118ca5820ced1e4d24a33e108af8f5c781d288f06b0ea7aa46
font_01_sfnt_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 10760 bytes
SHA-256: 13f8df9d89fcc57106449baba0d57e06d3c48ca79ca26cdd9c81c7078605ba5a