Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c95af5ecedd27d4…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 19:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e869c38aaec31ea92d88838eb95ae07 SHA-1: 249ec17eb46c98a4a5ae986d0bf33a1ae60f313f SHA-256: 0c95af5ecedd27d431fbbc4cb6bea0b5799f69ef6bfb7b338dedae94e8dca1b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The presence of multiple link farms on disposable or compromised hosting suggests an attempt to manipulate search engine results or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://benevolo.it/userfiles/files/rupelezegamizolez.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c77ea77d4846d7edbe0470489db512d/beriborikizolotefenutivuf.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b4d7d3e9---gipomapiradadelonetiwu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/soladafute.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/46315653375.pdfIn PDF document text
    • http://katachizu.com/img/news/files/21833912077.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/ginedorileku.pdfIn PDF document text
    • http://gnox.vn/upload/files/13752477921.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/xamuruzeradivoxelarijo.pdfIn PDF document text
    • http://caythuocnam.org/images/files/67056085578.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/16652300970.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16132607cef38f---bemiwi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d88393470---64328872379.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/tedalo.pdfIn PDF document text
    • https://eurotig.ro/file/tiruvivadumezagu.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/rarupov.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/xitafofaluwowawejubal.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/fadidowoxebozotiriwebe.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/jezazarubifu.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/39049835620.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/veralizajusunidibusami.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bb89cda8d---50656976363.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/39503850887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=naruto+shippuden+83PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10E 10900 bytes
SHA-256: 9c0eefc9ae4269129ef35b6977558e71209a6aa9169b361d21f2f54dbb427820
font_01_sfnt_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 17968 bytes
SHA-256: 634af1fe96afa167606d015b8c9a27b1672b6c523a6174a16fbf49ee6d74e1e6
font_02_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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