Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24409b8df191e6b…

MALICIOUS

PDF

92.9 KB Created: 2021-09-18 12:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c646dfc51a8b94aef1f4ed8ad63d02f4 SHA-1: 90db41e0acfa35acb84342c163d5de411a7d09ac SHA-256: f24409b8df191e6b041977c0d32f52560c1ebfe94a480eece48ba84d29546e70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://malovanesklomh.cz/images/file/ridefaxufajanejomap.pdf In PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/5122535557.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/luvalike.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/886e2dd4b4a4c1d90b55768bf683c345/sotisiwisewebufa.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/neneve.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/wofapexulup.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459425bf245---28979185437.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c3d8d80---nepivenaririkutizilidir.pdfIn PDF document text
    • http://aprt1day.ru/file/nubazitifinokuru.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/n5ghdk8ai67otkd2cnu09obhf0/baperatezatuxave.pdfIn PDF document text
    • http://reichspfarrer.sk/file/56920622570.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1j592394m0b4e8p4j592itr67d/90714714960.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/tasidabikapoxanewuxi.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/60370868564.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/89982151285.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/96101059637.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/58546368586.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210907110319.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/85960989318.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/tajiz.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/93726891437.pdfIn PDF document text
    • http://allier-genealogie.org/File:/rozub.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/78208408420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=facer+daily+mix+apkPDF 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_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 17756 bytes
SHA-256: 321d55fcce1ba9b8afaca82d2ad0c620fb7f4fba2e1279520bb924a37179f14a
font_01_sfnt_off0001366e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 10468 bytes
SHA-256: f75b2883d05aa471f5fb735c85bac9c192ec91d0072796ebc738d9c699b9ddff
font_02_sfnt_off00014e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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