Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b52564e26f80c43…

MALICIOUS

PDF

83.8 KB Created: 2021-08-15 04:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3f8b91d2793d4865dfff1c7426cff79 SHA-1: 545f336deb4af040d136368a4b92412af905ed39 SHA-256: 7b52564e26f80c434455a239f183401eabef1edb52626d10c24794375777fb22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

Heuristics 5

  • 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
  • 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://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/1ed8e1d01b22891fc16c8a57b8384039/movavijibazorugopap.pdf In PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/xumudijenikajogudefufop.pdfIn PDF document text
    • https://windsbs.biz/files/file/12570933442.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/moferumugevifelemu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf960d7ed---42929274712.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/jidupevun.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/24691456344.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/18804101714.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/45761345683.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37545290661.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15019d26e3---rinakonogumop.pdfIn PDF document text
    • https://coil.hk/upload/files/77771802295.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nepoxolopasonijara.pdfIn PDF document text
    • http://roocenter.ru/upload/file/67588957583.pdfIn PDF document text
    • http://llux.vn/uploads/files/papuvex.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/36cf9j3vvahn1stlovod7k0fg4/sanada.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/32f635907b237a28fa2b91ac947cb0f6/vezizumunabipowidulibedu.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/77319783911.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/64335868022.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0777e92314---83602769431.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/tavifonozuxefovojo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cepojh6qdja4jd5hpm498sgt1c/xeresimajeduwuxosasa.pdfIn PDF document text
    • http://canoeing.by/pics/files/43752957875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tecno+12+18+respuestas+palancas+3PDF 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_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 19448 bytes
SHA-256: 7ab09dd14292cba03c823658e7a5269b351bba8ba309c26013bfccfe3388b15e
font_01_sfnt_off00012495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 10892 bytes
SHA-256: d94c201d5249bf6d4e75ab040e7bcb61f446b90ae26f5e3eae53da65de56cda0

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