Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdb4aa2823e33e6…

MALICIOUS

PDF

72.9 KB Created: 2021-09-20 10:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a094402b6de97a5295345ba5d30f4941 SHA-1: 643801fa2f37976ddfcc0b3a351d4db8581f8af7 SHA-256: 5fdb4aa2823e33e642e3ab665b76e8f7a52e464d13b3b53da1a31167d88cdea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs suggest an attempt to manipulate search engine results or lure users with deceptive content, such as fake download links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://ketchas.ru/uplcv?utm_term=tamilrockers+new+movie+download+2021 PDF link annotation
    • http://panel2conso.com/userfiles/file/66801020162.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/73402455085.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137712710497---26976635069.pdfIn PDF document text
    • https://penal-garazh.ru/files/gepukagexasipiguje.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/xonekoduge.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/maluk.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0an3osps1brjj2a550ab030at2/fititamovur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a6ca3ed44---35454078086.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/gatejituxidodopopu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161328a9e01f06---43389064799.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/kukafe.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lozoputog.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/sibopezuwasizekunobuju.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7d80176e3999cf205749852127b0248e/rujeve.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/5107329714.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/35866632586.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/rm9o1rhitqsnvndc8kajf9s4hi/gesozafubexubinuk.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/vugorefilawukax.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5e15cc4e---20690471585.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/23728482420.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc3660815---nimiripoxotut.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/80885864019.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/mevulozitapun.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/11716689992.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/53885089149.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/92200974832.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/51076828804.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/84352120960.pdfIn 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://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_off0000b9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CA 16444 bytes
SHA-256: 5053f3ec1b4324d8504dc3811b78d936fb55c7ef3b110b9a02b8d0a39644ece4
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 10936 bytes
SHA-256: 15d5d241401242c93d11373aba7a0f40dc8bbd7f400c7631ba95a7a22f8a3c7c
font_02_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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