Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc49159ff6ab304f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 04:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e11e8a55d64d09b37eccc5810747d0b SHA-1: 2feeb535bf72d7e3ffd87d561650d71f1198fabb SHA-256: bc49159ff6ab304f98d563e895f18eea8400b78c2059ab52831be513b0fb14b7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6351

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.
  • 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
  • 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://pistant.ru/uplcv?utm_term=photoshop+elements+7+tutorials+for+beginners+pdf PDF link annotation
    • http://aliceinformaticasrl.com/user/pages/81287935056.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8af4b45a4---nakenifepebalukas.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612893ab3bce0---belorikapofowalirivosige.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/88c5d86cea8fa94dd561d70fe3c0fbe7/larebudepotefikuvovuma.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6n3onsca1l33vf6oj4rtcsu12/26096387482.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/711ecf4c71da3f2746f68eef9f1bd7ae/xumutopiwe.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/57fed9d298bb4d524c9569006b425c46/bikomelev.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/56174842681.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/80648996808.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/64350788641.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/delel.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/bivinajup.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/romotaguwosevopuwitog.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/molejipidukuzifev.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/82cd1d7e50f26d425f98c7300e8a3375/87612954863.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a7f8cc43acae7d0142c215654f4c62e/70967058016.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a1d19726fea9a4f5f0f821332f6eaa0d/80818353759.pdfIn PDF document text
    • https://eklyps.net/images/file/mazujiworuji.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/49004229929.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/90236674628.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/biziparasufeni.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gavekiwuwozepetupo.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f30d9a8a80982f00d5c6ba5a653f976a/natezovasusakov.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/fuvawalumipomope.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/81576225751.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/funipexi.pdfIn 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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 11236 bytes
SHA-256: f930887b66c1caf7d54823efdeec46b9211848113e54befbc4ed255a78bcb008
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 17704 bytes
SHA-256: f44b9728f50daa2401e68fc52bd75cc2d61156d52aa33942bc7798746bea1f2c

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