Malicious PDF — malware analysis report

Static analysis result for SHA-256 e432b57116d21102…

MALICIOUS

PDF

73.5 KB Created: 2021-06-23 05:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d076957f8f32edea6f23c8d946d1f8ec SHA-1: f32012b0f0eda61e43bf3ddadd878faf8bc18b91 SHA-256: e432b57116d211025a119369375aa0f18834580cd21c35d9fca228b48672e2c2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised CMS upload storage, likely to distribute further malicious content or phish users. The PDF structure and embedded links are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085043e603e9---134554062.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/87a0c79aeeea07169f7a5939b81d9620/4670325562.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/pumofemokikosuliwi.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/10650754234.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e4f5d807---35926087879.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/43964743221.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf12ed31f4---24601295993.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/44361966621.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5cc1f402f---fazanivuruma.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/fosigibaran.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/44645048497.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/56569177492.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6567ac6bb052fa07544b3c4936bceac6/39630114307.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb4a53c58---75230859993.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6s3nv9ciumseg3eqs39all31c2/pifivurisa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a969d0847a0---22914283256.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/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=simply+supported+beam+bendingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 5624 bytes
SHA-256: b90885d04bb3c82f6ae0c6469f656162844c2b26331cdebcbceaa67a7a818b7e
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 11392 bytes
SHA-256: 99b0e65b07616f4dad6a0b242626201b05c7b5bf29d679e6b88a8a176608fb40