Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73fbbc3251604a4…

MALICIOUS

PDF

77.1 KB Created: 2021-06-20 19:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 060deed4c4e5768947f1e7094ea61d6e SHA-1: ec980aa8c34951a2d50498f27dba6ee1e7bdbfd6 SHA-256: c73fbbc3251604a4c7ab87e8d1ff3047e636537a653de26912622d37ad3232e6
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 CMS platforms, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attack pattern.

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://ketchas.ru/uplcv?utm_term=paragraph+writing+worksheets+pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0hc5mhl37muagsd08ebp3nsfab/suzalove.pdf
    • http://patroha.hu/file/39159646649.pdf
    • https://audit-advisers.com/userfiles/file/vazuru.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4f457ffe4---18268780101.pdf
    • https://arvikabc.com/images/uploadedimages/file/28224006007.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a800cf6f4aec6b3bd5788042f214654a/15416890490.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f04b7f004---kuzaxedelifovisesomori.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d68be5a17b048937baa5b240d00cde9/90550141129.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0c066086---waxobekilamuvonoral.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/362f19b4dbe61e9fe56bc9a18f649145/vamifirilodoza.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef43c3a2eb---newetejogibamen.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080736176710---zimikanebatag.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089987e6471b---25860853091.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084688f9dde8---22807202226.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/rofatawolajafegakave.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e9248d5780e8fa1e620cf1ecfcf67432/topogamumolol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef68.bin
b9ea5960d9e87c5c03ccbd792dea23f72a478f1ba51fd180b31ea8371a275251		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 5428 bytes
font_01_sfnt_off000101ef.bin
b24aa724d7fb3d78fe8e18bf8e9a9f1af5406cef9d31e55b1a9f45ddc7bd6bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10520 bytes

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