Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd31d02ba359ac3…

MALICIOUS

PDF

222.5 KB Created: 2021-06-10 17:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b9f4bd083a6ed8384c6105be439687f0 SHA-1: a6f673b430c877909e0a792b9b9fd6c0475bb5b4 SHA-256: 3bd31d02ba359ac313278101d2d4c35fb60b28dbc82950223c308bdd70a4f4d2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one that appears to be a lure for 'Fairy Tail episode 250'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of embedded URLs and the PDF structure suggest an attempt to redirect the user to compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

Heuristics 4

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=fairy+tail+episode+250+english+dub PDF link annotation
    • https://aquafilling.com/userfiles/file/89129199203.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/28724295496.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5327f62f6a---3065174810.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebcc96c9e9---81931070148.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46654ba4b5---doxiratelu.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/33369701687.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/fezameketoxek.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a468b7b6---25193064432.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d9ece3ccdf7ec68b2916ec90ba0344be/mugeta.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084557acfbb8---84994169142.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/epun06s8m1lvcjokd0tnq2lg43/supujanesos.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23033528f---59179379944.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607790ab1f561---80927009770.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/mojavi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/83verk099me0dj2brkue39r140/zalik.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae798cb443---xozojalijapinav.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000212e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x212E4 125506 bytes
SHA-256: 104ed1749fb812ced7773a07dbbfbdbf11e647836f3c518169ff02376f59b514