Malicious PDF — malware analysis report

Static analysis result for SHA-256 93970fe630d8e9c6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 08:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 081099d6bedccfecf937304dc8d9683b SHA-1: 4f029937914e19d062815c4c08fdb2e24b381a97 SHA-256: 93970fe630d8e9c6b774fba150e2fc24c8b8bb8e5c85193d8682caf55be71a72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://semangkamerah.com/contents/files/20855467767.pdf In PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/67923313457.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/pibazefugitazuzum.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/tilajupiruzedovibexapufu.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/xotawupusifokowepaja.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/n6cl1kotousdh42u59gntak8i5/junetofuvajimalufedipak.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/sesugud.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/rufijinuwowilo.pdfIn PDF document text
    • http://normel.org/files/upload/file/luwejugisipipasadoradaz.pdfIn PDF document text
    • http://ty-int.com/files/files/63482527958.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4a16733e---17810454206.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/88593799134.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161486281548c3---2346595681.pdfIn PDF document text
    • https://suksesunited.com/contents/files/46115188198.pdfIn PDF document text
    • http://toroisg.com/public/images/files/gavuzebufazado.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/20086499578.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc4970d1c7---dufizezusunuzu.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/94820203029.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/46167556764.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/giweg.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/vofanukewunatudupewoxane.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca1f6c56f6---26381273182.pdfIn PDF document text
    • http://meskerjager.nl/media/files/14578022756.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/52123175866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=general+chemistry+textbook+pdfPDF 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_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 18080 bytes
SHA-256: 9bebb94c10a6838c110c2a23be275a7d1d28c3dd764b75c847b1736f3091c2b9
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 11372 bytes
SHA-256: 218d91e2c953577fad2bba0bab4e38706ae88d59618145702015b7e895c37d37

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