Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad7c986245c82d4…

MALICIOUS

PDF

63.7 KB Created: 2021-06-09 11:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1085dce0426a7c600448dcae83584cdc SHA-1: 8b093fb3509be74b0b6992038daf80f0678045ef SHA-256: fad7c986245c82d4d6ff8a053ddc5283ccf2c5b3976d2f2aa8181257d2352ef6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious purposes. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9514

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 https://ketchas.ru/uplcv?utm_term=strength+and+weakness+in+bank+interview PDF link annotation
    • http://euredit-editions.com/userfiles/file/23564844037.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/poleliberetodunesipeg.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0jguopn8nq0hce0q4kmh5upog1/93432273699.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/125630egdafk8rmgpnidkbncn5/fubizunirukelub.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/lewupajuwuguwalotawe.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/157cce6dfab76fda5de8a9a8c6940757/gifewiwokomojidadese.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0eceb473---ruxegu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rmqvtqttriiuoucijb8nr0mq19/gukemupax.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210528162216576971.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc2a9d1aa---tituwamekoxuxur.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8ccb9e830---58987056171.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb4024182---10912595284.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071145157987---sakupuxigozadolare.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/70623889860.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3e4c08dd---83888324049.pdfIn PDF document text

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