Malicious PDF — malware analysis report

Static analysis result for SHA-256 522418635e2ea47d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 11:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55549b70952cc3c9b9ed4f7c717f2aa4 SHA-1: 35ee98a69cbd068405a15db657d7b4b33a212998 SHA-256: 522418635e2ea47dce9f23f79a9b3fde1be811401e5aaa21910941709bc4e35d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. This suggests a phishing or malware distribution attempt, where users are lured to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted from this sample, but the presence of external links and the nature of the hosting indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier clean score 0.2284

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 http://romanakladatelstvi.cz/userfiles/file/54163152274.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17422467b---83538747857.pdfIn PDF document text
    • https://irrisyst.eu/files/file/furezejatosukemux.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/pibosogipugo.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/pcsca3ej8vf98ol2jro2bjmssm/24347181741.pdfIn PDF document text
    • https://togeltop.net/contents//files/26265487672.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/jatomurenuzajizux.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/73785268230.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3b74c6098cd8b1a284422152ae8ec5dd/juruxetunirixegizot.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fec0623aa2e---gotarokonurara.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/28259912290.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/fagojere.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/bufajanevatikozibegenare.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/liramibojav.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/53093541299.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/vevefufekexine.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6f4c2905---69154298930.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/43897113839.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/85f9ed34e5ef9eee5445d4131194cd15/weguwoxidisozif.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/81b4891bee6614e3be01d70d508a4daf/53137482027.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/31ce4dca4ba18a0a305ffa112c627973/21280943164.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/30673370866.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086062dcaa30---43366268700.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/14386318256.pdfIn PDF document text
    • https://retta-bg.com/userfiles/bawaninotarogisulopa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jukulonewipezesorewujagif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sax+lessons+for+beginners+pdfPDF 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_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 10892 bytes
SHA-256: ab3847fdacf6a652e1716e83edba913583db252028af88a778bcf1020a8fcf1b
font_02_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 16016 bytes
SHA-256: 8b5abbe7bfe6c28a9f2ebf46f7e17a42fd6e0d3f279e3a482451981b58282be7

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