Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b2afe19eebd17c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 20:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49d4365b24c2d584c4dbb4b016d4e73a SHA-1: 41eb2e1cd61ebf1d63d65277cf380d19d3fb3f5e SHA-256: a3b2afe19eebd17ca31f833cc44791bf9c52dc20cedae19695a7c1e287e1b4d1
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious software disguised as a browser update or extension. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://philabc.ru/uplcv?utm_term=chrome+history+hotkey PDF link annotation
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/zewexapanetovabuzi.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/60155568209.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136d27519728---serewegawure.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xejixubo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fejuzadaxoliwe.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/zosonomaxadin.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/levujibene.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/wowefetafubepizug.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/wopuxo.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/14755655335.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/86373598668.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/14542510113.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/tixelewipefexuwuzewaxu.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/88408664005.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd7872572---62460615392.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/badupulanurokomowuvi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416124c2fa6---40412082591.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/xoferosafe.pdfIn PDF document text
    • http://espicycooking.com/files/file///mowoxosafowita.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/26813231615.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/75113973930.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f9f4f960---8775886243.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/39277098189.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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 10296 bytes
SHA-256: b815340bfd6e3ae0804af989090810f6d024dc9aafabefc8bf6a644f64056fa1
font_02_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 18168 bytes
SHA-256: 55da6dd28ca2cf38b199182976ab8835c8c48df83d2ffed6dc8cb438a8614da9

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