Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9460b326773070b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 22:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c96e195e28413055a51a36e70cef8bb4 SHA-1: cc16681cd4146e724bc835a9eaad95796c82079d SHA-256: f9460b326773070bd8bae2843b130cafdf29887b6a2313c6c256539ca33aae36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=tubemate+app+download+2020 PDF link annotation
    • https://holocaustresearch.pl/nowy/photo/file/jadulerolirep.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/59209016801.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/6498231789.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/duvewegawisarube.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/58788569400.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/fanidebidugubenisuxejulex.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9a1996ea2---18926824868.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/54533284441.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d532b5f6d---70627188860.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/5134618514.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/19856486364.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210906193521.pdfIn PDF document text
    • https://thegmsbihta.eruditiontech.com/userfiles/file/woxokogixolotumosu.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/lomobu.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/zefejuziloleboges.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/95511361146.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/31979742913.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/pn0ufnoo6mn7koie5b3o4vv026/kudapusinijup.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/46884920247.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460aaee7166---zelegosozipewefusow.pdfIn PDF document text
    • https://phukienbep.net/media/files/gonivoruwixu.pdfIn PDF document text
    • https://arerp.kr/data/file///97874730255.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/28863291889.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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 17440 bytes
SHA-256: 0d257ddbbca41b8e1296e759846cc82ebf66ce1cf90ab9972b20a93cf8089c9e
font_01_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 10724 bytes
SHA-256: b2cc9648b5143f36c2b25b8b86bd97f47da077236ed115dd076ebb833fac24f6
font_02_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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