Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84d0630ac78dee3…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 14:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 59c1c9c076584bf4df22caed9a04ba0d SHA-1: 1aac21268ca42f2418beff34938101a457e2f967 SHA-256: a84d0630ac78dee397ee82720ae40d932589877cf41c228eb0b0869dcebc1022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=can+you+stop+ovulating+after+a+miscarriage PDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3b623179---bojuduror.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/17459245452.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e713af2f4e---najuri.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52685d70fc---nenigusaluponupiw.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/46827217044.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e923b945b---25406919857.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/munaviselewedovisuge.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7e0usbep67fhcrrkoenkp6htb3/mexil.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///lefidetepeju.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/98903812897.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a6a1bb4a---wazelosekukapowuvite.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kekeponugilopinedujagew.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/timixabika.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/784a0c745a2b9975a572a8ab4d6c9f76/widexaludokewajapige.pdfIn PDF document text
    • http://jarosi.hu/files/file/livenabuso.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/50132152803.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/48256a91f62e52fc63ea2c72f2bd9c9b/vovedezadosivo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e2c0ad7e---48884513476.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/39e4dd6ab17b6e26e7f439c3d7da0999/godidewuboraraxotaw.pdfIn PDF document text
    • https://fultoys.com/userfiles/nelinevuwumulid.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723d2b45190---44451564176.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/vvk2h2qcfiavnnrso8kqdojjd7/zulidifewinuxodokigava.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/zujuxo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b0212cf2c---vowiremitagisajatefa.pdfIn PDF document text
    • 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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 18996 bytes
SHA-256: ab35e031b1ea3818f71f5dd2daba4b8fe75ba1f9b87bd7926f384490db13a3d0
font_01_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 11136 bytes
SHA-256: dc1979de0d482b59e9aeb2ef7bb51c23d6e69d1741a68634250d0a0b301e2a15
font_02_sfnt_off0001338b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1