Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d2ebded7f32c0c…

MALICIOUS

PDF

80.5 KB Created: 2021-08-14 00:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce7b7f684754b103ed0e9906830cb338 SHA-1: f3381df688d11c1c3856cfe0c5b13f29b3e3e1dc SHA-256: 23d2ebded7f32c0c67c9b1795328ef8d77bde8144c7ac2bc0dc90ad7564b98c4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160767455c6183---16992593328.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0harrvcfi8f26ihi2t6m9f8u45/rinoduzebare.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/76504891491.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/287fb053ce8e6b918a2d3741c25ad258/bigelomenegijaje.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/rowilapogoseji.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/13629634889.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/s22orjl6osdqtig6himmibletv/bosukefaguxivofip.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160dac41d6ebc4---31304962514.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c87139bbe---nupodivini.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/nexafapaxujevaj.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/28475278944.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/50012719000.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/71541691283.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1cf27fb2a1b7870cfe5ce87191d012b1/46830447048.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/2f8afef1ddf64d997bd6ebe5bcecde50/84716646846.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210731_1887BEF8216EBF5B.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/pezenufeserigib.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/733aa6bafe613a7f135c6636f665ed64/47477554319.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84719deeed---77160835390.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3533d52ab0---65290376268.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/dapube.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab17138e6aa---rudogobemogazepivibem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ejercicios+adjetivos+especificativos+y+explicativos+pdfPDF 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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 17844 bytes
SHA-256: c699ad677e01d41e3ebd8d0e4e645e3105686796b5ce5147082844a49afca9af
font_01_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 10904 bytes
SHA-256: 98338ff151ee13aebfeb0f59bcfda0eb5e46f2102010d5ed5b57170662142d2d
font_02_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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