Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b9d9ace78d13b4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 10:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 139649fd606e14eebdc96707705d4e32 SHA-1: cec4425d17525f2838d2346be863fbc8a3852dae SHA-256: 83b9d9ace78d13b4f1e2bf1749c9d6d59c3f250751b5218f66d9349aa99f0599
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript stream, combined with the link farm, suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=assetto+corsa+drag+car+download PDF link annotation
    • http://mrukseo.pl/userfiles/file/44854620363.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e84799b0---15105563186.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109070915418646.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/76028198870.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090404132856.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/nofilalikut.pdfIn PDF document text
    • http://ymmicro.com/files/files/xemopawetixaxudezetano.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631008337.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/95473513114.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/fuvovewetixufabinelekoza.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137310fd38e8---74154197743.pdfIn PDF document text
    • https://norservis.info/files/files/29665928553.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/nugitezimoge.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/47851990808.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/xonakabitofoxafebomun.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/16800423213.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/wobunisolelivetar.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/85756028588.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/feluzamisite.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/41122838594.pdfIn PDF document text
    • https://krossi.ru/images/content/files/83895689562.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6b2ec15e---44401441550.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/22116011457.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/doragosimopiviket.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_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 10520 bytes
SHA-256: 8c429f8757a445decc5dd8316a5c99df81339447d9f6ad8ab6f0e3f945d6c794
font_02_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 18040 bytes
SHA-256: 38d73ad26e0e618babf24efb984d92b2d63de16246767fb66b02dcf3d0ab2867

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