Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4c02066c81ad9c…

MALICIOUS

PDF

86.6 KB Created: 2021-07-17 09:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 51b5a0ea3dc2431d204ffa10705a0bea SHA-1: ff5a029bdca82eff1dd6e54f75447afe07ec56cf SHA-256: 8b4c02066c81ad9cea475c828391a9fa787ae0e897599cf3753247dd4958ee3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the ultimate destination and leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://aliceinformaticasrl.com/user/pages/72667678772.pdf In PDF document text
    • http://planetamama.ru/files/file/sedasugamazot.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/68855384775.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/0acbeb47cfb7e1f2e9afa7bd14cdcdce/kidoboferiz.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4333c71cccbc5344a54590c311e46cbe/xapemorotave.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bec8bc52d64---9355973624.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/54496154702.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a936b25aa8---fitexak.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/80565746288.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68b6a6b29---37549949474.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/bobuzetir.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074afcf653e4---gobinosijukobejumigo.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/3809f73f46419891e9986336eb2784f3/mibafifasalisugirenod.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ad028fe0514b7b4c17f5818117b5c890/32019207539.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/778036499faa6c8b1279ffbf2c1ca8ae/wudadowofamazugaw.pdfIn PDF document text
    • http://chipgene.com/image/files/20210710_050113.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f0fe69501---xilamuzupulubezimine.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210627230139_6zwxia.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c1d8cb9---36200335025.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/fuzize.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670fc817ca---95125711387.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/92919084317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=all+assassin%27s+creedPDF 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_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 16856 bytes
SHA-256: a1f2b06b95762ce71cac4e03758f6039ea458d61015a066d65cc678f18aaa704
font_01_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 10160 bytes
SHA-256: cc7c126341849c9a3163e31722318d269f01653e9098327bc0438fa9b8452d97
font_02_sfnt_off000133f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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