Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0e84d54a450f20…

MALICIOUS

PDF

63.7 KB Created: 2021-09-10 17:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a9e3d4851b9efc1634455cd8c69e13e SHA-1: d02a6ec6849a3304544b3f178c53c7136166780d SHA-256: 4f0e84d54a450f20c8e5ca7462934fae575495ce66ed62297ef4b22d93458f28
194 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing trojan. While no scripts were explicitly extracted, the presence of 'cmd.com' in the document text suggests potential command execution, likely to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://oshcongregation.com/userfiles/file/ratoxuwedo.pdf In PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/61425615610.pdfIn PDF document text
    • http://bushurov.ru/images/files/92822894704.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/gulaxanofeku.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/39037160845.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/89930080808.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613907ad5f526---39510327727.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/duvipipitagugusikedazipew.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210909230228_4b92uj.pdfIn PDF document text
    • http://qdcmd.com/data/files/kosewirozenojesiregamofu.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/fowuw.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/71554176695.pdfIn macro / runtime command snippet
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/r6aur0en0a8sticosgr174t5kh/xojinuzomojilovowufa.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/wajakapokuniludigon.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613770a88ae67---71616220386.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3a3eadp17n333t6out5dkr20g4/wuxubuxuj.pdfIn PDF document text
    • http://www.jnvhardoi.org/ckfinder/userfiles/files/xuvilara.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/12387359876.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161334782bb52c---masawatoxonup.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/72542309043.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/37980719645.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134e4264bed0---lopiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=a+field+guide+to+demons+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 10660 bytes
SHA-256: 2512eaf9a527934e36a7fa2f6525b1c7ea6cdaa95926b990428a5646f8dde16c

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