Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc51273473c604e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-19 02:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31705558faa0817f27ae67b79524678e SHA-1: ad7e0d038fbe9f83b883f69c3b3d05bd11156636 SHA-256: 9fc51273473c604ee61816c4c0055b9617f4d3d596bc730c2d7f00ebf50b5663
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of further malicious code or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5262

Heuristics 6

  • 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
  • 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://cructi.ru/uplcv?utm_term=writing+a+android+app PDF link annotation
    • https://hk-delight.com/UploadFiles/file/ranozefexijasakopivanom.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/11841288105.pdfIn PDF document text
    • http://marketingnews.fr/images/file/4878999329.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/neziro.pdfIn PDF document text
    • http://pedraferro.com/files/files/79839392760.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/65455452491.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/goforidalofujuvagezawa.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/salugibotejukeretumot.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wikexerewosi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b2dcc66ab8bf065e25c77c0e7dbcd678/55543542281.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/buforufiserasobudatuto.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/72986284479.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/gizepelavaxopav.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/34834971748.pdfIn PDF document text
    • http://altinay-law.com/images/file/99196579813.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614036154f5c2---27466600670.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/podoxifiguxa.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/97563114050.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109092011543081.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf028e343---2106946373.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/femipelimazelosedaxawoke.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f06cecf45e3ef973de564699b1d3c0e7/84301090333.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9iudg9g5mironulaf9c907v3v0/balatofen.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/94192127732.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/koxezekuxibitamaresuv.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/54397025061.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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