Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ebbf1f6f9bb87e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-07 16:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0b7a3555384f940136d860e8fac2282 SHA-1: bbe1258012c8c986046129910412c3944a0b2000 SHA-256: 57ebbf1f6f9bb87e972ea1a5e7f77e7ba4861c5ed33c496eafa97497e5c3bc35
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS upload directories. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, indicating a likely phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4905

Heuristics 6

  • 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
  • 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://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/61890575595.pdf In PDF document text
    • http://chiengthai.com/file_media/file_image/file/lexuluropuketirijojawawe.pdfIn PDF document text
    • http://aven.su/userfiles/file/85449662612.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/99060118153.pdfIn PDF document text
    • http://climtech.com/files/files/wiwedesorukidi.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/99702379390.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/53275479090.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/77974166395.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a2d40d3e8---6920326019.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a502736f---8381121730.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/potozobojugexiz.pdfIn PDF document text
    • http://elma1.ru/!upload/files/lafazigudil.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/d4mpssltdv11td8n8nfqaq1sdv/wajipixizutidevero.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xozuke.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/nixokojurosediritadibi.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/61edf1088c9f3dafbd7f475dccad44ea/wosopijefik.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/sibavitavutudapulusafa.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/97261552747.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/kutafesirajalozuna.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/46575005513.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/kefazerogiwalevovinorit.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/toxedotepalebe.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/40274595708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=video+production+course+pdfPDF link annotation
    • 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_off0000bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 17980 bytes
SHA-256: 54cc143b8c4dde3746494c7f93b1e18331ebabd3c53159bcb61a994402b138f0
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 10472 bytes
SHA-256: 91819ee3a64a6c59212aef0d3fa3adbd04c7d33a3e0a014c213bb5b20a16d14e
font_02_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1