Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a58129fcb005896…

MALICIOUS

PDF

86.3 KB Created: 2021-08-09 21:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 095d1fddde7ed1b723ef5a7fd9a74e04 SHA-1: dbcf5702dd52eab3f974fe377bbad62ecf336734 SHA-256: 6a58129fcb005896b8d6ea074324714c3b661313443db75a0e9a86dada6432ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=wb+school+hra+declaration+form+pdf PDF link annotation
    • https://caror.hu/ckfinder/userfiles/files/57344141116.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/95611733047.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085258ad036b---sivulifegavisozefijipa.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4d223a9228a4eb5b39ce2574bba3bd2a/vorodas.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/divelusuperakifedus.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/kalijafosasevopoliwe.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5fa009e8f---xilarudexagoze.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e6ec2451---18117636763.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9c0gq6ff1ad8u126a6gdccpmms/63895270219.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/kowaw.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/28749520058.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3939674d07c498706ac95c454e220aa0/24278392910.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a82b0d0b---70061400707.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609976c983553---32912774259.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5578e9ceb---naranat.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/nawujifusujo.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/96475149283.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/jagilenigilijudon.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/65973603992.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/webunalirex.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a766bb3e00c---30637684735.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/60523965564.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/gilepe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 11016 bytes
SHA-256: d31fe1afa10516d06e987d8186cc1a083ab2a5f894ef09cd6495862b2260fe3d
font_01_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3
font_02_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 16540 bytes
SHA-256: 9f58a5d94bf2a5827b325871c685bec84f7cd9bb7a4267876aa7b3061b60c80a
font_03_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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