Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d2ab4095a1a982…

MALICIOUS

PDF

65.0 KB Created: 2021-07-20 08:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bee91ef4fc6e574822fa981d9e6d07f5 SHA-1: c66fd3ae548cceefdd573ab2714d9f22060e132e SHA-256: 77d2ab4095a1a982e14baa78f34d65624b2cb1fbcf4221faf7a5db86fcb95c63
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4986

Heuristics 5

  • 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://petala.gr/userfiles/file/23145847915.pdf In PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/zorekovovadifipam.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c154caa9baad86d97c5f8f99b8ba668f/moxegabonuwezatamejunuv.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c00c2a4c4---90883440854.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/f7quh39f0b6n3vse1csbpo8lg6/15215330934.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/48459924807.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hc60uuokh613vhtbi5u2hj1len/nadobosalubifinasolulavu.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/733480681.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/wulerusukaneradese.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/bujerofegivijo.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210720_103302.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/95680607037.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/kaxefujapav.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/95927148939.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076efbc97d2d---bivivanipi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/mn1ag84ri28slouvq4o66o3l7v/37484330141.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/36223067901.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607419f8c325c---xapagosekofu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/c9h5ifhn45qdvpk7bo2svv63ja/pumidalukoganise.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfeec2a10f---fodetuxagapup.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dfd9c799fda7623eafae0d061474350d/88429333742.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1ad9553d329245752de44d845007f053/zubukigefupoki.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/046699a8e3a14a6e5566652a296dc99b/87665754793.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5105b26c5---nutovejigemefezofadewex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=awesome+planes+cool+math+gamesPDF link annotation

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