Malicious PDF — malware analysis report

Static analysis result for SHA-256 5386c65903443841…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 13:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e39ee7555d099eb3858fff4240d96a12 SHA-1: dec1085de38b7a0279f0ac369409b657c42412e9 SHA-256: 5386c6590344384130aa762f64f39a09390f790a123f7829177e86e7418e7b7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. 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 0.9977

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://krisoc.ru/uplcv?utm_term=imdb+apk+pro PDF link annotation
    • https://makiriaszto.hu/ckfinder/userfiles/files/tomenufosujunebij.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109070108436080.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140533a12dac---80018208650.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/biguwukokatubi.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/7425382668.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/suwuxuraginoti.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/zofom.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/wurisuwuzulobabexifinegim.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613647610bccc---mufegizoxajegi.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/53316903224.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f68ba0da1---mupufukajamizulimukej.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/12099661439.pdfIn PDF document text
    • http://osayit.com/images/file/47030590656.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/tawip.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c6f02de92db9ca016de16738cb359828/rasafekololi.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/gezodoxuboxofiduraxoxud.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/ripuzasixokasufozun.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/45884447382.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xajusanewowam.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/rixomonugim.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/79539863116.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/notomuxisixe.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/56590525582.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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 18008 bytes
SHA-256: 4a812b43c0905613e05427b056a39f7cfbacf8d63d22152d84039b85137e9c8d
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 10096 bytes
SHA-256: f3f8bbbf6298d21b4a9cf65f7430010a83c4c201888be56ddc6866fb8cd6cef2
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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