Malicious PDF — malware analysis report

Static analysis result for SHA-256 231bf0f1d238dbee…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 22:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56cc85da89b105626c0a81ec47687b30 SHA-1: c573d3f086082fee4442764bb3d42c601c12acbf SHA-256: 231bf0f1d238dbee9bbc27ef662e4a4286eac0eccb6c3b3c7862d97cf348f9c6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to external websites hosted on compromised CMS platforms. The ClamAV detection indicates it is a phishing trojan, suggesting the links are intended to lead users to malicious content or phishing sites. The file's structure and the nature of the URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/126b506f5c5f4624b413b176bf31c504/85907145826.pdf In PDF document text
    • https://hanomanberjaya.com/contents/files/99836651725.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/9139439513.pdfIn PDF document text
    • https://etimes.mn/uploads/files/pijifidizuron.pdfIn PDF document text
    • http://www.bandungmesin.com/file/90652616598.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03389b868---73980479475.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/xosegizuxagojuwafuzizeno.pdfIn PDF document text
    • http://teraval.cz/res/file/63118807466.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zubifufipabedololen.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/xakunikojefisi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d58dbd493---8694344657.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/54847914177.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/bozifamezaduluvexub.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/56830648098.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f01f14fd---siwubelopilunadulalug.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/42632001830.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/2290342925.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/sijivaxa.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/78482424894.pdfIn PDF document text
    • https://ville-rouillac.fr/docs/file/sipuxetilo.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/jepixenesuwev.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/sku40r9eujvfi2mmth6442khu5/75220616507.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16285959a---welalixeparaderuvowazifud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e73ea619b---85884950566.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/fokejenawudodos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=koalitionsvertrag+schleswig+holstein+2017+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_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 21640 bytes
SHA-256: 9b5b1d8d74abaf810b526383713cae15f377ea4ae0bfe4f4751c32bf30368655
font_01_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 11388 bytes
SHA-256: 2e6875ff4fa7c9188c74e0587688f5984a2b1cfd495d92fdc1caa5be407ebc10