Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffdfe96201dd616…

MALICIOUS

PDF

440.9 KB Created: 2021-06-12 09:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 68517e80d77a35ae5514ce9beb817a0f SHA-1: d60a26fe62965cc71073089a03348ccc12c4ec82 SHA-256: 6ffdfe96201dd616554550e9fc60cb85cc643212fe94581a5ef54f91a9cce07f
126 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9445

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=super+smash+bros+ultimate+3ds+rom PDF link annotation
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3f2fe98541db623144cad15e2cc29d88/soxejesamulex.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1thob1blq67802bdm5hj9kgj64/deragujolenoki.pdfIn PDF document text
    • http://ippon.lv/uploads/File/77055502539.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/602d9590c049772688ab628cf72fece8/zetuvusikorenufolobe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af648392f7.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/72610126464.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36c0a1f3d---3971696651.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/18535473372.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6qg7b1u1h84flpsiebqs07rr74/5422238590.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/818a8e4e1d77f9229f1af62d4df531f7/67617315259.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1e320mv2hra31koste69sqie6p/bojitudesak.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/bbc30e5b517c4aaf99bd9023205eb5a2/giludovijivuxodejuxej.pdfIn PDF document text
    • https://medtek.vn/storage/file/89001966924.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/fuwoguzilovikovifedumidu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a390922a---54269536906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0006984c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6984C 5608 bytes
SHA-256: 8512d0ba49460a0724998e195e4c9f1364a78a36261b909e19614df20f4e4ecb
font_01_sfnt_off0006ab26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB26 11800 bytes
SHA-256: ae620b61706dae76fc82ef6facb90b4f2024dcec7c8a3f4784b5e08c69221b19

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