Malicious PDF — malware analysis report

Static analysis result for SHA-256 24123636b6fba3c2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 00:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6ad7fc108ab8a15c4f3f266b877933a SHA-1: 384f32c521aafd29590cba7f4cd8f222b9c9f6f9 SHA-256: 24123636b6fba3c28b3ebd44b430858e1d94c5da0de2f2c0cccc6e92ddeb42c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to host a large number of links, suggesting a phishing or SEO manipulation scheme. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://inwebjor.ru/uplcv?utm_term=monster+legends+mod+apk+android PDF link annotation
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/71227554142.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/97889928181.pdfIn PDF document text
    • https://premium-house.uz/images/file/81085227864.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/ganawefajatan.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/gutiwalilaki.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/xuvositobabogojedomaza.pdfIn PDF document text
    • http://poiskvod.ru/images/file/91190615408.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/86818311733.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/18127506386.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143db93cde8f---12742111592.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/gewibemidafu.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/mezijus.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614395dd4d8b5---48587635182.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/22124405652.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/40711903985.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091101253473499.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/sadezutamozarokinobenafi.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/96679568303.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/zexugivifedabinezapo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/adq6v82hnaqgon7m087jhss39e/64435892444.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/86506610992.pdfIn PDF document text
    • https://svltv.in/userfiles/files/sifiroreg.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/34188796739.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_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 10820 bytes
SHA-256: 9fa01fb558e9185be81b75dee803612e61bddf3d7d97bb0f6ac1942acec84192
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 18816 bytes
SHA-256: 219cc0e60e32ee79770a081e719adce3b5d2f2aa63e186706c836dddd0fbaa24

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