Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e0374eb8d32458…

MALICIOUS

PDF

80.0 KB Created: 2021-06-26 14:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9c25f7bc92d8ad88a48d676c1e4c27d SHA-1: fd2924fd23cdc6c687d9742aef9bf09259b17899 SHA-256: c6e0374eb8d324581e7e89aa53393be5919f3d5c94872cd99c4b3ff1de2cda95
154 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, but the heuristic findings strongly suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6032

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://ludifrance.fr/userfiles/file/roxipudofemusev.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ad9875af9---nimere.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/93411394024.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/083d3b4caf1ff9f6b198d3ab3b38aac9/67687273152.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5886dbdddca815c59226bd5b4886b97/fisogefizupinejidal.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bf33c060f5e95d7652764d78ddacc6a0/19406903351.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/larojojefatu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8795183af8c996aeb2faf6bbe85e8132/20172962471.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c2e95c2d4---40302619776.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d241c04e08---rilofefezoradosazada.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7da559e40---zofofosigumigiji.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/48233870081.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/24673088054.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df43397ac---sivuzeduzixij.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6a3f3cbd---80565388296.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c93fa453266---nudokegeniko.pdfIn PDF document text
    • https://amblamy.ee/upload/file/35042661613.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kenukatazesomerubabogipob.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441188ce3---neneboxalumuxuloz.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/vonikonupelarazino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nope+sound+effect+1+hourPDF 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_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 17564 bytes
SHA-256: b9dbfd3748ea343142275288dcbb3b900666c7aae492975c1d1e94a597ebd43e
font_01_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 10548 bytes
SHA-256: e4fdbf99635edda577cfc6c54544f23322dfea65273c26bad815545189fa2c5e

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