Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91d1eeb00226341…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 05:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca02da4de33ef1358a6a9f9195db25df SHA-1: 60d99656ac257343bc39437bd26d7ec8b1b244c8 SHA-256: b91d1eeb00226341ac3ef7d9c207e4e75b3b8f271f63954060f4770920a5090e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage and disposable hosting, with numerous links pointing to PDF files. These links are likely used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ce6t7pdoo6ldpoqca9eti6otn4/79837680994.pdf In PDF document text
    • https://readandenjoy.ae/userfiles/files/87771455433.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/zerapiguno.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d1a0ba9168f18dc8229562d447cdd77c/zinukafuzuk.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/78707004318.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/petovigil.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/nosajizebuvanupelas.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9014fad0f5bdd4f714dfea7bebb0043a/fetezuxidunumuxopu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5aa9c92569f3d1a50eb09388fe755749/65519774285.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/sedizurofawofijodaneziwul.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1630448926.pdfIn PDF document text
    • https://tckontrola.hr/files/35310206906.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/numoj.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/84442217773.pdfIn PDF document text
    • https://rosycaffe.com/file/xezikalafolubosil.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/03gni6dnp4vs0aub7c0ivrln80/sufafobazaxubezosedik.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6d63b9cb0b2b02215c23712fe4317002/66566573265.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/21908053828.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611259129be96---xenosalefetaxoxubamaluwo.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/24611187300.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/43cf327f772f565403f15f4e4269bc1b/77122293656.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106060354217780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=constant+marginal+cost+monopolyPDF 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_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 16352 bytes
SHA-256: ca471160ae61c1613f5972ad83a9e455d6b2f0ab5c79186d9b91a5254db486de
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 10732 bytes
SHA-256: dadcea4b8c6be317f3aaa4deadb812d905c37a06950ff49d6b8c9698d4f11438

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