Malicious PDF — malware analysis report

Static analysis result for SHA-256 77813822056016d5…

MALICIOUS

PDF

65.1 KB Created: 2021-09-06 22:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4f53fd3e6e826204a372594a7162470 SHA-1: 8187a795ec9a8352193987092b3da01ce49c25a2 SHA-256: 77813822056016d565f3b860ba04949a033d14ecbf0354ffc378685d95d67f16
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5242

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 http://sanzmendia.com/userfiles/files/74398826477.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0b6be859de53ed2f75839195a2c1a1c4/rujatuboke.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1386eeeb3---nudopevuwonerojixoduka.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/dccb2823732cc2e316772f6bef2a4962/juwatikunotigidiwelomodib.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609aced00a---71420214206.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/aablvgq2kob3c11c78tjnihvd6/bepetujoruvixodupuf.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/79041738376.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/69260594318.pdfIn PDF document text
    • https://cooperspick.com/files/jepukulodegerufuzututa.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/pagunarodemelinipoxalo.pdfIn PDF document text
    • http://fatename.com/uploads/files/202108221109071890.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/mofexidelividuxutazurixo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f4edfc71585a69df63f21b395e2a815d/57860467871.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/38082391544.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf24a758ea---91847462112.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c100558e4c0---bifozu.pdfIn PDF document text
    • https://amblamy.ee/upload/file/kuziximabus.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/wovexiwekujoludazavenub.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/5590690612.pdfIn PDF document text
    • http://gotween.com/userfiles/file///roxarifonidiba.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/25548747045.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ae249e922f1f8622aa2c840f1d35c475/jitetususubovuvenolun.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/91225985702.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e02453e9e67---83585649766.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae172584---xurokezilowak.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/daximamuleta.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/nafidonipipuzone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tesseract+ocr+java+pdfPDF 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_off0000c1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CD 17492 bytes
SHA-256: 4b0246d477c1cc27da1d7e49c0991303325f2f4e608c62167bc58a8063b7ac53
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1