Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c931039c19fb123…

MALICIOUS

PDF

67.8 KB Created: 2021-06-12 03:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: afbbeea5bd0a8b4995125bd183861908 SHA-1: 116427436ac9c824f7b0d898068e37f4efdf6099 SHA-256: 2c931039c19fb123a6fdbf1b85d52651775b89c1ffd48f10155095c20850db15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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 https://archism.ru/uplcv?utm_term=pdf+into+excel+table PDF link annotation
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/egmnetqoes39eiura52ip3k0s6/diwufifemumivo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fab99968---23746817925.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/7a57c9f4764b41228a382581a5a65200/nupaxopuve.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160853640e9c9d---dogolar.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/tojibakorizuge.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/i3udm6ot4ot4lveh7j8rv1ej37/6953733466.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/60845839730.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160792f20e35bc---buvutifajofu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c607548a---botuvinililuzaxixiw.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/82861603160a82367a8775.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703679ebef7---lerezu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/84aklh3hfr7vibae72u8edgtt3/gogibolubel.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609b680aebea1---47892122651.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/e0j4867dm6ttt3jsi6bvfp8no6/29639998589.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff2d2186df---lirolijobafu.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/21023411044.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 4736 bytes
SHA-256: e2e94a318053bf142725f3c403cf037bbd204c73947ec59ba63fee4d4ddf2c85

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