Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f1b286c2866ff9…

MALICIOUS

PDF

70.9 KB Created: 2021-06-20 00:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3f893d7fda029c0cad624c683a0ae1 SHA-1: 8879662502d3652dc3f43aeb3aa6d1dafd2c09a6 SHA-256: 23f1b286c2866ff9c426ca38e2cfd6f9cd6d050669ac33ee9df331448a9c62a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm designed to direct users to various compromised websites, likely for phishing or malware distribution. The presence of a mathematical problem in the document body suggests a lure to engage the user. Heuristics indicate a high likelihood of malicious intent, with ML and ClamAV flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://sns.hu/_user/file/lolamovominuminudeboweted.pdf
    • https://yuss.it/file/notofugufunuwonovebur.pdf
    • http://porpora.info/imagenes/imagenes_contenidos/%5C/94024935740.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b41a68c54d6---zewilowoloxenomo.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a7f633f67a9ec4c6ea28c9c2611fff43/12317027191.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2998f9a8f9---nazonutiwo.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995d05257f9---rikibeselolibolulije.pdf
    • http://otoozevran.com/resimler/files/nuxemezekoz.pdf
    • http://eltonltd.ru/sites/default/files/uploads/kapare.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/rso7t5hkjuiugvfj94e810mges/66155695911.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/16l499dokkit3765lqf0dneut5/86492495052.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2b83798f---lajudu.pdf
    • http://maciejabramowicz.pl/upload/files/file/22548943719.pdf
    • http://aliglobshop.com/userfiles/file/32528253885.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5891b9c0241c7dbf4fde061b8b722e80/lefituxomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=find+the+missing+frequency+in+the+following+frequency+distribution+whose+mean+is+50
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b600.bin
2fe0650b3c5f7d71882465b2ccb7c28b5448f5b817ba872b48e94dd7ce95b822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB600 7372 bytes
font_01_sfnt_off0000c926.bin
cfb1cbe49d7e0af917de5f57bb5495a662f62cb21e4e946edfc8072d13978f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 6116 bytes
font_02_sfnt_off0000dde2.bin
f3bc5399ce43d697a72952828eb444bd5e6d4c0331c739f8f126733d4b149cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 11088 bytes
font_03_sfnt_off000103df.bin
ccd0ea095085b9379100d4de0d13d045157d8501f46cd3db2ef5c00475687e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 16088 bytes

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