Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99e1c3235d924e4…

MALICIOUS

PDF

76.2 KB Created: 2021-07-27 20:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f701e3544c1098ce7d52cfb41c06c4f SHA-1: 90fae0ddd4c666d97ce9b5379e3bfc1c8cb45b57 SHA-256: a99e1c3235d924e4a7075232ef8336ee949f9f741914087f4f2b7985d835e386
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of embedded JavaScript indicates a potential for executing malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8658

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 http://gerocuki.hu/user/file/48457099741.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e9pdc5tf23tr2903pc4pu6bv3d/wonazapez.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/mobatomavagugizijopal.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/19898524408.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/dopetufubofamilenobajaw.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/52805439192.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/3804i2elp1982o7pf0al33rgou/99686089275.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/23609649627.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/94047837026.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072f8ab6e3a0---nobixuxigoj.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/21573200698.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/2436a9c87ec7bec18295b467cd8c3635/juveji.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/kosabimo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/89556257221.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a556e75bda4---77230474992.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079df369a5ca---35918258825.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tgs40kdgj56b7q5u178sf84j67/toguduzidekeligome.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/cdf45ed400aa4a7f472613d1988e8911/geruduferulefik.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d065a500---tojederazasinalat.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ee358b3af0f02199f02b98eaf0c7ecb1/gemefuzomerafi.pdfIn PDF document text
    • https://alutat.com/data/file/pimejupusujodibud.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b84ccbdb72b---34914315773.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9820icjg56fsgnvite9aqcrdi2/jujoxivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hindi+full+movie+download+in+tamilrockersPDF 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_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 16816 bytes
SHA-256: a1c5a4e878edee3a8b107cf384c9af0c043a53f8a56c639116b6dba78d8c1f4a