Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07b2c9cdf3a3291…

MALICIOUS

PDF

79.5 KB Created: 2021-10-05 20:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2c60f29065d5ca9f0fc016d7b0becea7 SHA-1: bcb3a3a34644ef51809c96a8c788b4bcddfc9c6b SHA-256: e07b2c9cdf3a32915072f5b1ba2b5a5feb5a8823a79cf952850dc35e731a2db6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the link farm nature and heuristic firings point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://roocenter.ru/upload/file/42182661006.pdf In PDF document text
    • http://luberoff.com/userfiles/file/funabusafisawipaxufuzijoz.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/fagaxafelibifadejafazol.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/91144993070.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/faxisasoto.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bd634bc06e---nokulujokokixapirato.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/pevetobetovopemaxajimab.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/26560517238.pdfIn PDF document text
    • https://khanikango.in/file/78436795883.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/jonusukujelubonivijujo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4b374bb71b707745a4bf840eab3fcd9d/benosadofumuwanonebame.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/kenakaramaretovum.pdfIn PDF document text
    • http://greenglobepms.com/uploads/dipevopob.pdfIn PDF document text
    • http://findusafranchise.com/files/files/kebivekufatabifovusidadan.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/23073192083.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614affc447d0a---fidupirowevage.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/8481122744.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0930/d279d97219e239a577f8b3d0a567decd.pdfIn PDF document text
    • https://turbooto.vn/upload/files/nasijepexebaralavozolebab.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/25858855140.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/pafujopazu.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/soxulobusaduxi.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/zobatesoxanumadowadudezal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sql+and+nosqlPDF 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_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 17656 bytes
SHA-256: fbf8977918a7741eee08b63c05c175d5cdb4e43f6050e03fee0dfc4accbb7676
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 10040 bytes
SHA-256: cc99ebe99f02e52e14dc6f59f596fda1a4572d8b62585e0b07aa5dd082824100

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