Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f63b865ce50b1ca…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 16:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7aabe226fe47020d7a91a0d43bbeae67 SHA-1: 0d89079ed4f935c487b469a68c97a41abade7500 SHA-256: 9f63b865ce50b1ca6823e91dcee965247d64893596ecbd31588a4aef321e05e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves leveraging these links and scripts to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://geobigoni.it/userfiles/files/67655225853.pdf In PDF document text
    • http://epmachine.ru/d/files/pexipurikelat.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc1c7d9a10---tavitezep.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/f50g637ntc4b6f2ngpvb92f854/dizinarenosiwe.pdfIn PDF document text
    • http://citranco.com/users/files/nonubejalopejupodusiguni.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/wotovabadudugifom.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/denijabazodimuxinokerej.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/somozoludilolerod.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/31017030054.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/nasosedilereluzemi.pdfIn PDF document text
    • http://boxethai38.comupload/file/85432477993.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9686ed8d4f---89282495463.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df3c922fdd2---gebivepak.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/tikeneretapirisalita.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a92e7f455989b2d2cd156225970685ae/vuwewapedalolox.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/felezikawuwarakegusogu.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/39814254443.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611556fddcd1e---biguzisapifete.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/fubakopukejidikukele.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vv75sca02e1okc0rk33qlm7j62/jobifafupika.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/dakinebuvupura.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/wajida.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9ce92f419966998641d0bb57c2e04989/bivufubuvubo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/1802247068.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/11966140709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=idioms+worksheet+answer+keyPDF 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_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 10708 bytes
SHA-256: e2f6eb0de510345d7a49ab25fc7d7e0117a992066cba49e3984d60aa4f5b2e67
font_02_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 17320 bytes
SHA-256: 05474d075da699bcd07451a3771a740d64ef8b52574948a076d915a1bd4b629a

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