Malicious PDF — malware analysis report

Static analysis result for SHA-256 5033b510a9d0de44…

MALICIOUS

PDF

81.7 KB Created: 2021-07-25 19:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb3d2d508a0a18f7a290b6674dc1e145 SHA-1: 7559fbbe947a56557aba2166ed926716904e7e44 SHA-256: 5033b510a9d0de4432d416cbca490d5b93c5742a2fef80956055e37cbaa8fa69
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and other domains, many of which host further PDF files. This structure strongly suggests a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9206

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 https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/mh8ovn9pjo1q0a0fatlr4a29e0/besepaxojawizutaleg.pdf In PDF document text
    • http://secohthailand.com/file_media/file_image/file/lativirosumilumajapobo.pdfIn PDF document text
    • https://camelcarpet.org/d/files/pazojitumavipiniwoxezub.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/11624317250.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bd494871b17c6cbb432b0a69565d0499/jegavuvu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/85q08b7kvfptdfvi874let91c2/59645387415.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/lenizurozuwurirusejese.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5c1d1073---66580811906.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/foludeba.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/23593002506.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/gobemumifemexuwuxasudifid.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/logonuvizumimitubetitojiw.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rosufosikiluvuweseniwujup.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a993e727e36---17929238911.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/fosuruvapexogud.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb8d06792---57138229775.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793ef59b2b4---mixikixulape.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o40rkp6800nabb2g5aat6fkko0/8078660441.pdfIn PDF document text
    • http://imi.vc/upload/files/vobonidelegatapewiximut.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/69p1nmam0qpsfhe3na7ghdkosh/51396357463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=present+simple+and+present+continuous+worksheets+onlinePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b989897cbcc35d70e4c00cbb322ebe72/8297136075.pdfIn PDF document text
    • 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_off000125c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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