Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3ef4fb46634f69…

MALICIOUS

PDF

112.9 KB Created: 2021-06-25 20:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dfea072b5919a0f322d8068df079d8c7 SHA-1: 74ecd7cde5fbab4f0979d96ede8bc6a2c0842186 SHA-256: 9f3ef4fb46634f69cf0f02d09f753ff0ca8dd7aa40fc33cf68503e3ca8eb0bfc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/coqqij72cq3ghmgb7jbda3tuqk/komubumudizuwojonu.pdf In PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088ecb551824---manizimisazenegopagef.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3inj0hde2v8o0epcqcqtoutqk3/nebelorafugowijamojilu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/berogeredane.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608be64aac221---90585513206.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/54389092045.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/81218099053.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da88550b17---92424364540.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/70442531606.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f0be89caf---63633817029.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078fdf9bbffd---43618431397.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/45849013084.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/lizedebugo.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f202085138cb89c2d4987aca5a4ffe6c/mixopulumonodogisogew.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a80275975f3---48225303748.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a985800d732---wobejuwod.pdfIn PDF document text
    • https://ptogel2.com/contents//files/pudadufuwemibelixesado.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9929f75588adda51d7ab67382cb25b1a/mexivelimebabonutirasil.pdfIn PDF document text
    • http://demkapi.com/resimler/files/35205328614.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/eb22f4bb9d5dc26719f03eea4632ea33/91126528966.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/69399794287.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b02079beaa6---66217119265.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e363ab77e25cb4b626de52bbe073a4e9/pomaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=locality+meaning+in+bengaliPDF 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_off00014d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D60 21092 bytes
SHA-256: 20d90af047e48b5e2106dd59b20e00f3c64702236d862b762cb8b586b71e6276
font_01_sfnt_off000183bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183BB 10516 bytes
SHA-256: 8583fb3102c4ba865a6bc08f4c4396fc904e5c52b9267b07cb0d0e561e1fcf64
font_02_sfnt_off00019bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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