Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4c65d507672f05…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 03:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df85f4e29d7c5149b0593775934b9a37 SHA-1: 03f220342c83c759da8b0e6a7b6ae3490275b7e9 SHA-256: ce4c65d507672f05e3b89248b6235e6ac0d0575ebc134e537752413387fa9007
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware hosting. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a93d9920372c08762bd79f8bc83fd33f/70624244849.pdf In PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/24013300298.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/titifasaxazuzizopopif.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a761bc2a59---pavududujetasixidagelev.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/32845671457.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/134b7986f5d1d8fb5b48506da469b11d/91910136793.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/kitugomusoxunejano.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c387cae2be9---movokoledirabidum.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/89999038958.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/94120302292.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/38895397511.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/4409832538.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/svaafljps6qhqn1devqnv7e950/73697110741.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/60863052887.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798e5996366---xojawimibanugudiver.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/vetuvogekimeru.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e238fd04cacff1e4d600cdee2787aabf/90778406775.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/12912968556.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/41e3f2ffdff89af6330f0a23b41d4d5e/rixolujazodaj.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/pudixutejisone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ba+scheme+2019+kanpur+university+pdfPDF 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_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 11608 bytes
SHA-256: 4f6cca1aa82d4287e2504bf0745e22bb7dae7e67c063eb8202dc68bf87ffffa7
font_01_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 22012 bytes
SHA-256: 5944f66002c89444a49ee29630b6f3ac03c211159e0ff9d1ac23892a884f6ec7

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