Malicious PDF — malware analysis report

Static analysis result for SHA-256 43694d181cfc0f8e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 05:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5bf21f1295b1849b8f583ef69cd6e9dc SHA-1: 56dc8b4c882bde006215f7073981972e8b5de859 SHA-256: 43694d181cfc0f8e95a660a5ed2e29bacc9cf75b25f1b497486da0aa7a78609f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised domains or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to lure users to external sites for phishing or further malware delivery, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5696

Heuristics 5

  • 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
  • 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://aliglobshop.com/userfiles/file/bodekoxoj.pdf In PDF document text
    • https://estoniapools.com/contents//files/55136417278.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/91418574167.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/pedix.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/57579775393.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076e154c4d00---rujepusabidamazaro.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/mafofolunesozoxonixamilak.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8f0acced5bd5def6b278f56cb307c934/4085334912.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/geveju.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/78aj2tidvnisdrun81qpah8358/bunuvelagosuzovagenule.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160892667d5c6b---wivug.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8081552f68d8ad947ed3a2e294706e46/jalowaj.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99af2b893e---jisemuxuloxanibevavav.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/vajadoweviw.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/74e151a0774a4227ac23692cc4f60f87/74353817761.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/55079863064.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078edcaccc41---55928670946.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/tabigibubogosumebenavuru.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/xutafanubitojupasusop.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qndnhfp6sc6pmtss8q8tunkmp1/venororamelikosebaxanopo.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b4d017efc9b2d4f417b93e4088ca465e/nukibedijifimulumofov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=risk+and+asset+allocation+meucci+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 11004 bytes
SHA-256: 5faf4424e7dc4320f9e529a5ef1798e0f67a53247e0795dc69965b1cb76443ba
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 20680 bytes
SHA-256: 910374cc818210bc1b6ade532512c7153d456072bbb32808dd716bab020eb6e3

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