Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caa33a9421ba12c…

MALICIOUS

PDF

97.0 KB Created: 2021-09-17 13:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a7a6c11465cf9d5fa3207a5b864bbb7 SHA-1: 2e21b0946d2873331f3883ac8b7fba676f520ec3 SHA-256: 9caa33a9421ba12cfa7abfd471241aead7701fc4f93015023050eca2a9b5a61b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=venom+movie+stream+free
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141d339b9055---23183236923.pdf
    • http://consol.hu/images/uploadedimages/file/muvusosuluxejoje.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/15a283b3393d962b88b4641723b914cb/51167446158.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c23e4fb7a---xederulinolanegiv.pdf
    • http://logicparcel.net/uploadsEditorfile/gotefamu.pdf
    • https://samsungklimamodelleri.com/upload/ckfinder/files/figezumenarigoxe.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161316337384b2---jipariranejexepi.pdf
    • https://mimpiindah1.com/contents/files/92949886096.pdf
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nugiluk.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb711dc4f7---vogizalidiluvikezisoj.pdf
    • https://kirmatas.com/userfiles/file/vakigenari.pdf
    • http://langmoon.jp/js/upload/files/84342471520.pdf
    • http://sarkar.ie/userfiles/file/78784281931.pdf
    • http://gazdalkodjokosan.hu/img/userfiles/file/gopuzojuposisejivoxisu.pdf
    • http://pcccphucvinh.com/upload/files/semibave.pdf
    • http://roocenter.ru/upload/file/71736806604.pdf
    • http://uran-berlin.com/userfiles/file/lovusiwuwukimivotelobob.pdf
    • http://lechioutdoor.com/userfiles/file/76657981088.pdf
    • https://mclandpin.com/calisma2/files/uploads/37636292349.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/otbnanl6s05vuh36fn3kumb77m/noxowenisisufafemadet.pdf
    • http://atrsara.ir/resource/files/dopatajapijugonezebo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ba.bin
a67918bf8d2a4cd9a537a9ff42634b6e51bf50f8207a8573b2981eacf72c3cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 10364 bytes
font_01_sfnt_off00012931.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 16792 bytes
font_02_sfnt_off00014143.bin
f7cde9be577192a9bf0ddee509a9ec9967c9edaef016d5324e6739b3f6ed8a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14143 20436 bytes

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