Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b59d52994ab9ae6…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99b371956e90a0b14594a74facc15000 SHA-1: 76dfdfc7e7669cadc50c22bdf6bf01d406aeb335 SHA-256: 1b59d52994ab9ae617a6f54fd34a60d024bae4a9e9842c20af2cc0d156ecce15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6550

Heuristics 5

  • 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.
  • 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://hzjksj.com/images/upload/File/nonilas.pdf In PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/75001245919.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/40972468939.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/jipanobapunuzokusupos.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/wovilatutuwonib.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/nibisegajixugasubebolup.pdfIn PDF document text
    • https://shibbirs.com/media/files/17542044018.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e45056e4a86dd9b528322b704b0b0ee7/tegafibudepepax.pdfIn PDF document text
    • https://ismart99.net/upload/files/tarorudolon.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/tld74dlv4ii8trevs6kf5i2721/48677919290.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/43869182257.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b770b80b577---malegozotufe.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8ff3750730f1c5841ee6f19e65b1fa3f/pubemonoj.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/fovawodevuni.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/95503818974.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/26979571813.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/3202582979.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fe7219e3---55409537301.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b16e64882---88231516755.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210808114217.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/dc2d232bb1e4d105fb11d233bb23b5ba/vetetuzixumarutag.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8cdb70a23---86828251350.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/40194091342.pdfIn PDF document text
    • http://cutskytools.com/d/files/molugupegimisotexezaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cat%C3%A1logo+jafra+noviembre+2019+pdfPDF link annotation
    • 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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 18532 bytes
SHA-256: 66d450689e7e32d3741de8910c9599370da9a477cda30062e1d0185a8d4d5398

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