Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ffa8f81b341e2f…

MALICIOUS

PDF

60.9 KB Created: 2021-09-18 07:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47e007f78ac92246258d86bdad181155 SHA-1: f0a466b9fd9c3e3eb18f6324e07940e4a5164918 SHA-256: 63ffa8f81b341e2f5cae2e91e72257a2f4904e6468d68aa66c2e772939e05e9a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6927

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://empezo.xyz/js/ckfinder/userfiles/files/sefejugopokezid.pdf
    • http://agendatourvietnam.com/hinhanh/file/susazejenuzunuzomotumam.pdf
    • https://eguiders.com/uploads/wukimadaxanoj.pdf
    • http://circolonauticofavignana.it/userfiles/files/50150501483.pdf
    • http://wmc21.com/ckupload/files/gugitewavilatetu.pdf
    • https://oriental-kitchens.com/userfiles/files/56992029696.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2fa3fea7---79977376034.pdf
    • http://h-n-s.net/userfiles/file/16362034904.pdf
    • https://grandplaza.bg/uploads/assets/file/pudagazupivex.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/41753274620.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161416d62eed20---sefanarigufil.pdf
    • http://kite-surf.sk/files/bulokoxelokosotomo.pdf
    • http://www.tobywells.org/media/fckdir/file/fumabarijediwimatodo.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161357d1f7e726---ribavubata.pdf
    • http://csc-021.com/userfiles/file/20210916222755_5ec8ir.pdf
    • http://mintaialuminum.com/d/files/89674133588.pdf
    • http://togclick.com/media/userFckfiles/file/sobimokupimasop.pdf
    • https://vhssirimpanam.org/ckfinder/userfiles/files/banibamorisepuvores.pdf
    • https://viscom.bg/uploads/wysiwyg/files/tubabebemizobaju.pdf
    • http://cee1968.com/ckfinder/userfiles/files/revijibigosumetinanijefu.pdf
    • https://rentcar888.com/uploads/files/202109061400224166.pdf
    • http://ilyxrace.com/userfiles/files/99612903318.pdf
    • http://ahcxdq.com/uploads/file/071217563870.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614324d36c928---mipamoxap.pdf
    • https://xanbiente.de/userfiles/file/moralifajukupewulu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=thgss+player+apk+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b554.bin
3503db6ed111ea5cafcb76aaba0525fe37514ea0d124e5b7577b0ff931a6376c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 18612 bytes

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