Malicious PDF — malware analysis report

Static analysis result for SHA-256 0856607ea875ba73…

MALICIOUS

PDF

108.3 KB Created: 2021-06-24 02:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 739618f5e6e7b99c3afea8a98cd8126d SHA-1: 59cd22ee629a16464eb91ba322151b15368cbe9c SHA-256: 0856607ea875ba737b5c9075eba2f510a4d71e14f88942de663608b092ac5c08
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for further exploitation.

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=my+rosicrucian+adventure+pdf PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c741df433---zexorijozexodazovaguju.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a19a006249d326391267f133bbc1c879/togelonoxufexepar.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1666530380bf8806072ec8a60ace0e55/jivowekutuxodap.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077a950e4bfc---66668013996.pdfIn PDF document text
    • https://bselink.com/userfiles/file/bozifetavovazupanudozuzal.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/53138339988.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/b7e4f6808a74d4e37fb15832325d2a26/bekemomaza.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/pudixaketamat.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210623040928295.pdfIn PDF document text
    • http://mesterek.net/tmp/wazolajevaruwojorexi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/8576782552.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c796a73ae6---nizuto.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/55399516492.pdfIn PDF document text
    • http://specimport.by/files/files/kabebidunat.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/7bk8ipe82g272gv0rcp16sr90d/zewaverekovebuvuv.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/69096714901.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_off00016433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16433 5284 bytes
SHA-256: 23688584e3281227295c56e900914849ff518e39b838e6a09664c3193ded1d43
font_01_sfnt_off00017658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17658 15112 bytes
SHA-256: a0090ceb917d2faeb1230881c0f5a2c77fb9345bee7e04af24f55fa04e14e4ba

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