Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b1f3eea09a3f53…

MALICIOUS

PDF

96.9 KB Created: 2021-09-07 19:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe82337af9da47495155c9f09618be32 SHA-1: be6d28f1d38672de798e5d182fb7d718b8f82153 SHA-256: 45b1f3eea09a3f530c08052fd522d9c306b7e6b234b9ca8eeafa26e46e2bbab2
164 Risk Score

Malware Insights

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

The PDF document contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The 'SE_INVOICE_LURE' heuristic and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate a phishing or trojan delivery attempt. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rainbowfurnitures.com/files/files/33794503154.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c04f53c9f7---91321771742.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/99434674975.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/22797592137.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e41bd35ccfa4129c4c1b7e0a9a99c3dc/84865318403.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e1012a0e684ffc041619c4c05fd6016c/99774127322.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6864780d451741a3f9774f9bf185d5eb/85844987509.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/90878908267.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/sugago.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/kizifamikujekinotelaton.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/94604374422.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/38322623459.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/44952008114.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/99206527834.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210705150545_wrh82i.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/nedin.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/db0cafa585f915419abcf4b8d187e32a/74364049942.pdfIn PDF document text
    • http://cobmedia.hu/include/59685968126.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/33919248242.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b5fb9991e---kojazezunajugad.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/bebc637adde3fbffa16ae45bc2a98105/27953097935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=manuale+uso+e+manutenzione+carrello+elevatore+lugliPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 10792 bytes
SHA-256: 7839237fefe2884c3eb6ec41c1cf1da87c59d8b86c41f7770c86623bca7fd5fc
font_01_sfnt_off00012bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD9 18860 bytes
SHA-256: 645134907223733a7161e4e187fb1ecc1b180323ddcb18f671381ad1e034c3a5
font_02_sfnt_off00015e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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