Malicious PDF — malware analysis report

Static analysis result for SHA-256 991f4b6b067c64d8…

MALICIOUS

PDF

67.1 KB Created: 2021-08-09 03:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 267fe3930a6a4bc4a4361ccc7d4452bb SHA-1: 12e8ba209a8e9348c2d8972699c1892506924f20 SHA-256: 991f4b6b067c64d8929afdbd1df4c675f8415ddcfcf12f170def2ac770e03c75
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a PDF phishing trojan by ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4355

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://batikatravels.com/userfiles/file/zusojivatenavu.pdf In PDF document text
    • https://privatecambodiatour.com/userfiles/file/18408729935.pdfIn PDF document text
    • https://tajeer.co/userfiles/file/33069155526.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ecba8a590---luvet.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/vimazuxanapejufi.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/89667554371.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/07f64e7ff7f680262fb3f88d71792ab2/93177354409.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609837dcc62bc---53429565442.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106291835005168.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/janulele.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/3396442558.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c201cd915397ed3a6e7e7261c2dec6b9/vinusenasapop.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///pumamajavasasuzakufusov.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/zikexajajitiponavijeduwes.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210621191501.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/c454a10ba83de9a2bd513cb6e16ff403/23392830986.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/62aec0b83a377a0cdc89606c13710b80/404568038.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc528bd5f19---tudomuzalufopulezumelajov.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/1068188322.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a0e13af4---26779247243.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcbdb5c3d62d01416693a6afa79f2e93/nepak.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce25cd727---fanajanin.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/67831828985.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/93fe29733f4e445f25b1b5e21c5712a6/zarilupiwuroriwafuxivo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511be58a87---miwazavoruwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=aati+hai+teri+jab+yaad+bahut+aati+hai+ringtone+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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10908 bytes
SHA-256: ed5f1a56dd35f933c0e83855de0f6280f8cf03e28222dbd30215e6f6c5937fc5