Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f644d06bfde33c…

MALICIOUS

PDF

171.6 KB Created: 2021-06-19 21:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: aed4d24dbc47ebe2a659580f54a17dc4 SHA-1: 47600988536151747097d011a44b6651b457c127 SHA-256: 33f644d06bfde33cb5c8b719ee788c7e60430d3c621d5a0c1b13c0ebf411f492
162 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0095b857f---mufuluwo.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c760cc5df38a6c26d2178a5dc8192ea1/6809374308.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/nazizoduvunu.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/85544420841.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/38416623949.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/dewelegotevo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc5e2a872---kolulujupilovog.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afe13d24542---misakotetufoz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i7p4spgcm11luev9i5bqe3ku75/guluji.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0c0875a9b---47915885121.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d79eef5bb7188d531748e3906e0934b0/senigukofesajivadib.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160799e00a8913---59673266017.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/1914d233a50b5795a30b16df64c33dae/46474357783.pdfIn PDF document text
    • https://dineflon.com//files/25995896720.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d27e1c482---61914955162.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab74db385---10541499859.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/95eb5aacaf75c7c8871f3560ad500954/zolefofox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=age+of+wushu+dynasty+hackPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C54 5404 bytes
SHA-256: cb0f0cb8fc988822b7fc23cf95a7cbc83fa3dbc3a32b48479b494f965a1bdc7e
font_01_sfnt_off00025ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25ED2 9316 bytes
SHA-256: 50c35c84020b7bd8289f26311864932bf4e9d54a235e0fd403b24ae42577a6fe
font_02_sfnt_off0002788d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2788D 12352 bytes
SHA-256: d2689b459abb6c131daf734fd3132e6c948212f0257a4b2676d28ddb796ece5f

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