Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b6f28ad204f78f…

MALICIOUS

PDF

91.5 KB Created: 2021-09-06 13:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6187b47d59e477e99f25f82dc9d7cf1e SHA-1: 98fd4027fd1dd0710e7c3cd8f03e59b37db68c2f SHA-256: b4b6f28ad204f78f96a499be24eabd7009e03b8dc2629d04c6abb133876b5e0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown URLs strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pnukovprsrh1235t9al4cmt711/jarowubepisolagido.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a4f7f559c4bcc18b98b0578af5bd3989/kemelawilijotexuramatanen.pdfIn PDF document text
    • http://elskenecologie.nl/files/tetigorupusiguk.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/finawosenakovapetaje.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609300cbea014---4361261840.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070e14205634---21298967652.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/nogolubofabo.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/bijajobadapas.pdfIn PDF document text
    • http://topas.lt/userfiles/file/92057594116.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/71832368248.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/zibosasixati.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/68772059509.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1c4ee72b65a71ee2c2fce694f013a67c/32596957094.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/mamedujav.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/29568947377.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608de899ac967---49754154879.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/dc00170ae31f3aa4c983b142bf48f635/42404524519.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d852ef715---zowasuwup.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/tuwomewuzu.pdfIn PDF document text
    • https://auto826.com/uploads/files/jipazodeziwuzewi.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/93840902794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=important+banking+and+financial+terms+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_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 11148 bytes
SHA-256: 3ac21a655b8b018d5944a142877ea3711ab642d3c1344138dfba7ec218dd48a3
font_01_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 17692 bytes
SHA-256: b843ac708362eeac15164b384799a93023431277338869b9e503c8896b270b6c
font_02_sfnt_off00014826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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