Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c17aaf75a1739b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 04:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ea74c25b66f10cd06fc0b2101b1af76 SHA-1: 2f5f7e65219f50b7367c716f963c712408417656 SHA-256: 21c17aaf75a1739b25f591c6b51fa3e48595a8e708b361541355773c9fba6a3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=mediastinitis+pdf+2019 PDF link annotation
    • https://semut73.com/contents//files/39186250503.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/mewejiw.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd5bcef1b5---pebapizinosebofewemaso.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/nmm46nna68fe312m3dcr5llq8l/1996821897.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ab1b864c---25308833391.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/dilavalotamagof.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/purafaxosa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bee1fa7da0a---tiwibegafebojej.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/mobelaladup.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22b1d259c9---22185706723.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lesozuwelimorifesudel.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/dedezokuv.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/1f378564d677b94e6f42e0b257fbb34e/welilagaro.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ed87e38dc0c750cd045e09b145674340/togegamali.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/sonomawoxuvimejerex.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc864c524c---kubamonuzuzejo.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/wefulijanijegakad.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/0b824107e20eda9b72c961052749c661/gebukepezowamejuzigiwuno.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/85060601717.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/38732028914.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/neluronu.pdfIn PDF document text
    • https://brod-plovdiv.com/images/15450249407.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/89304876037.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/tudifuxariv.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d69703d05b---43477559695.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/14751417098.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/bamikefuwapudet.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_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 10680 bytes
SHA-256: 8fba1c9daee601ff9d6de0a16cb701c0a2dcfed2174c4f9058f0df2cd80f705e
font_01_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 16780 bytes
SHA-256: fa47a0c42692ead5ebf742d7e20fe05600c401c1e2315aa408b4dc45d7b48b10

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