Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef580ecdc6a31245…

MALICIOUS

PDF

50.4 KB Created: 2021-05-19 17:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91719441f4084ae0bee961116fa38c6f SHA-1: 57f68b8e0ab9d3acbced36231dcaf7beb00b8e8d SHA-256: ef580ecdc6a31245f4a8f91a856eb5bc9a152f0fda20b2ad9fd6bdbc31b45308
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous links pointing to external PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, indicates a lure related to 'CCNA exam model paper PDF'. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6781

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ad7fae6e5cf0434c2266a5edf3ef8520/27825590226.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pmb867ulelilnhob7fu2s22eiq/92082057025.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/zivepebimudetaposaf.pdf
    • http://www.deopendeur.org/imgUser/file/20185513260.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nupew.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b006aea30232567decebb92c10d0d8c7/13446396713.pdf
    • https://alternativecarrepair.com/userfiles/file/fezuwezazerofu.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cnf41k33nd775tls790c52l0jh/54636883121.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r2lih57gnsd90keinnb628bib2/jokipujirizusexaj.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bc7a7661---legolezebi.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/ferokasedoxuwotolek.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/01po1ludo1tbr9svodfmr96r4f/nediwawoxixajipekafajosab.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/12717d6a2d52f02af046d4965e6c7161/nomogifigika.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ccna+exam+model+paper+pdf