Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf87a091dd76d07…

MALICIOUS

PDF

92.1 KB Created: 2021-09-12 14:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e35f91556770a78eb76c51827b613f1 SHA-1: 1c8c682ebf1a6623366c59e8e7547c540bbe6331 SHA-256: 5bf87a091dd76d07bd3432c7aaaf9f008aa35aa3d7511a107bafc1411a93c29b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on different hosts, suggesting an attempt to obscure the true malicious destination or distribute phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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
  • 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 http://dpsnowodworze.pl/userfiles/file/nuxet.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c188139160da9ad34fdf0bfc836f348a/97118543767.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/14722366411.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/48324015216.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/66671019377.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/46611733401.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda4e473de---19402168935.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/83959996331.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xuvovobenusosevuxuwa.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/poguguxu.pdfIn PDF document text
    • http://yepuco.com/uploads/files/rojusekaxavuroresenup.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/22945563657.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d85d169115---10232990609.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/koxivilesunetobivakeval.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/gakubitevujaba.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/pegadixitokiwasov.pdfIn PDF document text
    • https://premiersuli.hu/files/files/72991973250.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/61356057986.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613715d0706ca.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/dijoxebabo.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/nijijufufusasi.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210907080835175700a8cex5.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109042220532539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gta+grand+theft+auto+mod+apkPDF 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_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 19136 bytes
SHA-256: f731425543d36b26ab065a045e1ca34bff9add383527d4bb3e52f5d2459550b3
font_01_sfnt_off000131e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F7 10868 bytes
SHA-256: 8bbd8c25133e67732eaba3320ef8cc2a982a8e17492d3b491e6e84bea44b0ae5

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