Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfe0346659f2d74…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 15:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3939f077315d291e10b78b270317caf6 SHA-1: 431299e3a5620367b984102113bebda62f29a3e6 SHA-256: 2bfe0346659f2d7473af8b1dcf2140c71d331272a407fab3aeff28462c0478e4
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with multiple URLs pointing to disposable hosting and compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8784

Heuristics 5

  • 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
  • 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://kubabus.cz/novy-web/upload/file/josajakegonubagut.pdf In PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/11686440601.pdfIn PDF document text
    • http://bulmarconsult.com/files/70483788852.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/79259453351.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcdee74e5e---sekijafuxigotewomeke.pdfIn PDF document text
    • https://projetovm.com/uploads/files/jesed.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/59296295531.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xewakuborekadop.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/bafepenedopete.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/47034198072.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3bb01695d---nosevexovavigipu.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/denaduwobokilutatefiperod.pdfIn PDF document text
    • http://mobiliteit.nu/files/64801746562.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/kamavuvese.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/72171881953.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/11307561237.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/watunusogenori.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/99138948034.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/91237074860.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/791f9a283cbe153487679f1b4028ab6c/46553653895.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/gevon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+san+andreas+ppsspp+download+highly+compressedPDF 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_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 19036 bytes
SHA-256: 5dc89361ceab6ffc578492c18214dad0636972bf1309042e6b34c65377db9da5
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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