Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed2b504139e8e3c…

MALICIOUS

PDF

54.6 KB Created: 2021-09-01 17:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df6620f3dcf570d6d962237eb83c1551 SHA-1: b3c730d669f9db1577a481796c1ff0b5a62133d3 SHA-256: aed2b504139e8e3c9cfd624b83995b90a82b0f56177922179bf197af4c601648
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for SEO manipulation or to host phishing lures. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7535

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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a956679---59651726929.pdf In PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/83898367091.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944a76a1631---dukutimasifebefeputafu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953e3a977ed---virejavobibividufotu.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/guwenejinurupurivoxu.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/dabozolisaguwalusuno.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xivevibajefokotiziz.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b82eaaa6a6001d65e7fdd33f24890c9f/71956890047.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/51014395878.pdfIn PDF document text
    • http://maksimetall.ru/files/fafekilenaki.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/bujavexakuxeg.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160887512d73fe---5914627354.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609251df01bc7---kevijoxumorezixal.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/64307948999.pdfIn PDF document text
    • https://petikdaun.com/contents//files/77036315878.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/39848824806.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d08f3be75---muvixonizabotozutebozeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=high+absolute+immature+granulocytesPDF link annotation

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