Malicious PDF — malware analysis report

Static analysis result for SHA-256 484b795428bb3f13…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 09:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b71667de30cf4dfa351305f0eca91f6d SHA-1: 46c16f0e1afe6c06b03044f6fc5db18b472f8769 SHA-256: 484b795428bb3f13f5166839cc9b06fda311c271bba65b542f619339decd9948
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/vipovetadubidipegedu.pdf In PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/fogisovalotitabuv.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073dcf1272ca---93983279162.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/67471423870.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160decadb94a4f---46501755802.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/11956268232.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/13223004629.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/76539152309.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16127662c8c8bf---kesijor.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/24938088157.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80816dc3ea---46260664353.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/70230808811.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/naworebalugikabejefoni.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/54868952067.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/firulidosipo.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210720133741.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/xasibarisogawove.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2e520a12---tozovevazawikux.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/109efa38845803905788f969da9990e4.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/gedodilomuma.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e7699802---kumenobovarepovopuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=learn+german+workbook+pdfPDF 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_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 20180 bytes
SHA-256: 7a453efaaf474f0e209b99664a68ff94d5823fa857abce6ce7e69be098bcd842
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 10712 bytes
SHA-256: ec1616e8a0884ef83071e3d4dcda6d94bf0604907beeb4731f7925a6c0371793
font_02_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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