Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d4f6d24a02fcc2…

MALICIOUS

PDF

82.9 KB Created: 2021-08-24 23:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 291c54b01301139fdddd731eba89c023 SHA-1: ddf8154d52203300889eb9248fbe05dd6cc5937c SHA-256: 98d4f6d24a02fcc2684cbfa6a8dafcfd3e68de529599d0aa6055aa2b13067565
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nhagiatxanh.com/public/default/ckeditor/files/rivun.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/631369e07d1c70c60bf1b928a76bda5b/50004195118.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/wodokuzamamibijipit.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vtb35t3app84aadadffsped9ra/9277741115.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/804e35761fe526a164a262a8edae2fc5/ziwovi.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/xitazaxulekozinuwefo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6aad6fde008ad022886b7752a0669124/vejuzewafaj.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/48136963945.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/tipebexadalegisifa.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/wirifekaxiwojozonibuwa.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/zipuzimodetikugudevuwo.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/42148994805.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0f15ddd6---36329171617.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160afccf9e7cf1---temoxigikazedafuzaxukak.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/xajakopoguwugekes.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/90832069477.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85be0165f3---vijotaketulizuk.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/18076065090.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/vorimutuduwemuzixakipapuz.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f364e639a0---kuwokulabo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609592a596eca---90712584577.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/56360773687.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd5a1d977---vulevarunegemitano.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071af8464fc2---tapuzuribe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=second+bank+of+the+us+apushPDF 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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 17012 bytes
SHA-256: 2ebf3a27e916beec71d4beeaa66fd79ddb2278ab192451ab78ec52d90b587311
font_01_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 10884 bytes
SHA-256: 9c7757bfa6b352e9d9ceaf544a83d0206e9c095f3542faae49cc500025ca493a
font_02_sfnt_off00012670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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