Malicious PDF — malware analysis report

Static analysis result for SHA-256 360cb082d0531c8a…

MALICIOUS

PDF

79.0 KB Created: 2021-05-28 04:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c92513a41635f0ef44ab076869e4dccb SHA-1: 2b910794a8a323199c5d42806942ab3fd57ea229 SHA-256: 360cb082d0531c8a73f085975738697aa83329bca0720f59ced6e2f72f831464
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no clear user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8211

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662fe90e3d---42349039757.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/65143240352.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21d801454---22421787479.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085dcb2dc8ca---5369136927.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607008ee72e47---vurix.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef1ee77e2---pibovexiwup.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16219251308807.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/57262549275.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af5518da6---jugemipetas.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b428a8fa4---97825236091.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abd77eef9b4---mafejogaf.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5bff74750273ab287b9f3d5c9f00842a/xifile.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/30055997651.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/c18horvd9etm85o8aoth423fkb/61708701541.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb9f05dd3---vibonuwem.pdfIn PDF document text
    • http://nakatka.com/files/file/xujelonosusazisup.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a277460be7---kigomikiwojajirotefezo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=desaf%25C3%25ADos+matem%25C3%25A1ticas+de+tercer+gradoPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 5596 bytes
SHA-256: f3b49a1bb2ca9bd969abe090e8ed43b7228094f54c37538c819ccf7e2ab99c5f

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