Malicious PDF — malware analysis report

Static analysis result for SHA-256 b828a9836085ca6c…

MALICIOUS

PDF

69.7 KB Created: 2021-05-28 09:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9cfd5b89f63120613f05b845e86babcc SHA-1: 32b28cf05b8b0e9b711a916f67f334acacdaedc7 SHA-256: b828a9836085ca6caf443f5af860cb4cf9260e95202af491206d1c9ea7fbecba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9588

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 http://boathousebrokerage.com/userfiles/file/toxakezesawa.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/sgd2brtjg35jerj8g8ud24jtg3/pipevegenegabugapavobod.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a83774d5a5a---gibemo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210524052040093.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9705fa99---levarojiwi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vmshba89rmkh074iafkrrv5icm/lugixolinane.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073008797349---ranemumu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0e3a41c0---fexamobadowukususu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e2fadc1119a87ea8ce85bca4eb09a5ae/63927394607.pdfIn PDF document text
    • https://banghenails.com/upload/file/latogatonafuziwanexeledu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afe71c4f11a---xawoboveretopufewiwavig.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/45190736756.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/46238205080.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/63165746492.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c658324c2d---xogeratomafepadujaken.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f05f095c7813977c84aff694584ab98b/37746177380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=n%25C3%25BAmeros+divisores+de+1261PDF link annotation

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