Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5be8419986fcfd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 00:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c61506af25d2a9495aff112c0b1fcdd SHA-1: 60edc31d729553e899d48e6f4cf7d52a7f0362c0 SHA-256: af5be8419986fcfd5a5fde5a71a2f80c4a7e09cadbc2bacecaa9b09042c7c460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload directories and disposable hosting sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8669

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://smidgel.ru/uplcv?utm_term=define+tax+planning+pdf PDF link annotation
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39792da9a2---45925779411.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210714_12A27F6A7F6FB8A0.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160929ddd952cd---vubagidof.pdfIn PDF document text
    • http://infunplastic.com/d/files/batujekepativebigela.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/90717474642.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c3de7a57d---xapuvegunawasuz.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/73703547011.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/0669ab324d7604ddb264981dd2898adf/67715303058.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/57194194126.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/voludaluw.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/53437093491.pdfIn PDF document text
    • http://brlairport.com/images/file/48364551532.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/repara.pdfIn PDF document text
    • http://irths.com/upload_files/files/88394113569.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b4e2b14814---95179785055.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/79128030191.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab2fb1c2d---mofupodo.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/kopetedasobadofe.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/26127091453.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc940656e92---2722407179.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37fc7da0c0---gakogibamuzesivanolifiv.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fddf2c16520---61807315185.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/91077376029.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/niremitezonexor.pdfIn PDF document text
    • 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_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 10388 bytes
SHA-256: 2e27fa41add7d9c1c445b6acdeec417427389b7a01b6a0d2f87bf89e7fb6b178
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 18424 bytes
SHA-256: 2e89e701cecca85952d07d46a3b66e15277ce4186be7b7602b9790297e4358f3
font_02_sfnt_off00013bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1