Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e5ede503a2daa2…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 04:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a4df3ad5074af5e2b5b775f9574ca55 SHA-1: 31a5db5f331c6febabc8bbb792b74b05055406bd SHA-256: 76e5ede503a2daa2070635b0bba9c3ad5a2d87a9eab3b03a4b2bf43c73b198a0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious content. The ML classifier strongly indicates maliciousness. The primary attack pattern involves a link farm designed to redirect users to potentially harmful files, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d367ed35---butozofamo.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607033e13e5fb---kebemebisujexuzowezim.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087de934a866---5570378394.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/nirowifakogosunogibu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/034a5de48fdbf0380e96b45a104a6d7e/nateruxelixisozixaf.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/9476906979.pdfIn PDF document text
    • http://zzquansu.cn/d/files/70991340643.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/48953535024.pdfIn PDF document text
    • http://potlista.com/file/files/37505350997.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3904a530---27714484144.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/35025009459.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/25040240217.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/17410842451.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55351145809.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b956d79f0c---ranude.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c9fa8e7db0---kiwugogewirefofenuma.pdfIn PDF document text
    • https://marosme.ro/hirek/file/lofizus.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/bfa87d8de480804a1eeeb8bf7e4145ef/sugubusitesavezuladuli.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdc276713a5f946b17f88fbf1ae56f31/94711072046.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l1r1etrarm89t1arrh2qe7ltjv/63117467984.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7cf3d69a9---69471968166.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/73b8b1603a68cdf68599c1c82f55d991/61468983408.pdfIn PDF document text
    • http://aven.su/userfiles/file/dukefozepewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mediterranean+food+menu+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_off0000b8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A7 10536 bytes
SHA-256: c12cf452ca27e5d39393b0295b82c3d7597ebf6352d58cd86b58068d7e074446
font_01_sfnt_off0000d096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 16636 bytes
SHA-256: 80b0198f7e44699bfaa546be7aec39623190fb5b0e358be08c27ad21cf1f5565
font_02_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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