Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e279f5530180d1d…

MALICIOUS

PDF

90.4 KB Created: 2021-08-11 03:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 31f88c3bdbcae352f1a31216ff65040d SHA-1: ae3014c01ebe7e196531fc1fd6597a03be1a7183 SHA-256: 5e279f5530180d1dfef6b40ee91c72f0ae00aa907d5265032becbf273f7864bb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of multiple distinct hosts and links within the PDF supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9500

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/0b323bjqpughcaa2cb545vhude/jegefikagejuba.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//banegibevuribizajut.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160be18a9a3be8---gomuzozidawavelafi.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/renureguzuvereteriw.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/sobel.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/suzawatalowivadiwirufev.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/13357387536.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/fulixipuje.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4178157e---mosegaxab.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/gakerizu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0baee0a8eefb1f33eb04f820d772dd89/81877679328.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fcg0t3dqnvjs1nub5qusgkb7m0/75974212425.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/efhkrjvg282p6o2f8rm8cvsqp4/34761705617.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/75569932276.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/zafidoxetadexomikaj.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/rirexodi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458a8d8480---15048997682.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/23veub3a7969dd0f3oga50hbrt/18634884656.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/54371509f7387a8b8d38f1921f8c5efa/repokevop.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3va8btrdu2mb41qvh91amv7aq/15971774552.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/eolc868v3vf1hsh6jdtqsb6bhj/zupigadebilimebatogodixa.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/xepobonogenasakabufuvivi.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/serak.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/na8jrfgboaodr2cb47stmh0p9n/55758864856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+emerald+soul+link+download+guidePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 10772 bytes
SHA-256: 4b75894a7e8f092bc9f4bd56ce75f5fedadaa9f32b4399a28967f0c0d68a32eb
font_02_sfnt_off00013c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C74 17564 bytes
SHA-256: 960bec5782994afb7113bf6b62dfa43069702479f94eba562611acc4abf5070f