Malicious PDF — malware analysis report

Static analysis result for SHA-256 e971764c60a2fff9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 06:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e1bff60e6c39a0d85355b4332dbb3701 SHA-1: f2a9924878b7fec0c48469e959e96d78f2940686 SHA-256: e971764c60a2fff93d0af4d2f57c2c20a37905c6846efaf61f4eeea435b7f178
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress upload storage further suggests an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kyanite.tv/userfiles/file/rajemasawokozed.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/124e205f549368075758a5642b2fa29e/kufapujikefufewamen.pdfIn PDF document text
    • http://someteme.com/archivos/_20210907234557.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/97143019086.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/80664632642.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/xibozag.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/83034416701.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161324d15291c1---55186264914.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/68225698980.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/51094838140.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/66458904610.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/4898917063.pdfIn PDF document text
    • http://nenorm.com/files/files/tuzokuma.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161338e092f025---6793999008.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/moresuse.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/rojosukipemelobanexalo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4299d1f4f0952ecaa92827691b7f9a91/71738539351.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/mofujuw.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131282f5862c---80599686939.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/sorapiwezadorogolanazi.pdfIn PDF document text
    • http://355353.ru/userfiles/file/32583442347.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/jetubup.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/dibunikig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bachelor+season+25+watch+online+freePDF 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_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 10828 bytes
SHA-256: 93cc89d5e0a8e9c3a06ad967c240d0231d6aaa20a52effb0501b68f17f3fbf2e
font_01_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 18504 bytes
SHA-256: aecc24c42ebf24d62cdbd346ca92e88cb8e395bee3c426ad383223e568bdb499
font_02_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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