Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53e493f735ad134…

MALICIOUS

PDF

73.3 KB Created: 2021-06-18 06:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80faf410a546e9ea5b75ddbb4f6b0631 SHA-1: 037a5884cef70e9ce474b4517662ae6a1de0a78a SHA-256: b53e493f735ad134981a79974f338e97cbc169cbd763397e44a385aff39f3648
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document uses a lure related to a popular game walkthrough to entice users to click on embedded links. Many of these links point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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 https://lee-trading.tw/archive/upload/files/81760814188.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3a9402ba4862737928ae4c2718e91ada/sabadadebefeganigudizuf.pdf
    • http://casier-a-bouteilles.com/file/sejawidusaguviw.pdf
    • http://domholidays.com/userfiles/file/13610805014.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/86492930584.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/et9loq0u6e3og69ah77g41k490/firosuturoxuxufenadirek.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75b22a345e---71845188700.pdf
    • http://ekolojikweb.net/upld/userfiles/file/waxagukiv.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/5a08047667adb16a3144e79fef9346c4/raxug.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/96d29bbba98c0dd3c1e7bd0e9a724f6a/44888561593.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160741c6dcf4ba---13435055741.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16088884139ee3---58893884674.pdf
    • http://sy-smile.com/upload/files/zefaji.pdf
    • http://clarksville.net/wysiwygfiles/file/popezesomixur.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160956769367d1---wodonuwulutowusufas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mario+origami+king+walkthrough
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd95.bin
36cf7c78f130be526ad50499e428d3ca6488b9d6a596a30dc5b55c2c07b56784		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 4848 bytes
font_01_sfnt_off0000edeb.bin
e318d335ddf3cefc84732a1ae394375c354c70de37e878ece512925ee46c1cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 10912 bytes
font_02_sfnt_off00011312.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 4324 bytes

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