Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23f0640ee5a285a…

MALICIOUS

PDF

65.2 KB Created: 2021-09-25 01:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11891abed43b9a22518f203ac0c90b48 SHA-1: a53ea66af19c757922135dd42c9bebbd273bfe29 SHA-256: f23f0640ee5a285af7e896e84e755fe99f885c652009e91ed23ab9cdf672053d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple external URIs, some pointing to compromised CMS upload storage and others forming link farms on disposable hosting, strongly suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5755

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://grafconsulting.pl/Upload/file/mejokiwilivovuwimi.pdf In PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/pafire.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/52469141971.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117b510771---wimiwiwasokuvewivukupeza.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/40691417840.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/teluwusowuzifezusipon.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/97018706149.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/80453937562.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/rugolorugenukogomebolav.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rawijevojaje.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/958113142.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jetataforofimidexafiwu.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/82578015590.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7643ba9f---94485383258.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/ximiboforujenu.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/simokexewoxojotuj.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/5255725268.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/78483699221.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/zijolokisogokum.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/87658661904.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b00af9d6---nojovesulanifaf.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29399204697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=embed+video+cannot+be+played+androidPDF 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_off0000b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB207 10812 bytes
SHA-256: 1efd51ddd2dd0fa29c93b16fc722a0bda0da3c16fee0bbe53ce763db2b5d3197
font_01_sfnt_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 16904 bytes
SHA-256: 6097d32c1b77a0b23bfaf39a8b572c4b08e3f0fda7b393748829823e5319014b

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