Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8b67a557c5ec7b…

MALICIOUS

PDF

93.0 KB Created: 2021-08-10 19:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f65fc7ea3101e2985e8f884cbb5e075c SHA-1: 1908605224cacbe96ab5a0db254bb9732d2e2aba SHA-256: ba8b67a557c5ec7bf9d0d4f04662c87acbd8cb5797584d41104c2f73154fb5ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body was unreadable, but the heuristics indicate a clear intent to redirect users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824b3b5759e---luvobobazoladumowov.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/714137a43739abfc9b1fe9a027645015/95656894530.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/jugowelegugalu.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/270909152392.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a038b4624---26949144168.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b209bd32a8---virokalerugutate.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/87173144624.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cab1f68218cf03b1d44d389c5f5dd52a/22735878070.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e01032c0e---43453437863.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/92945388751.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ac3b129181064f3f5c969491e40a1e84/vozetitupizirumemeko.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/j4985bmndilpab21um3n3g140u/35466267693.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/56493813011.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/nasuva.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/pivifabisuvab.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/fajane.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/kafirevulitigataxate.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/35vghmmibo3m5lh8re04klqfge/zubokufekiwumotedem.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/rijagiwak.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/kigafaropogo.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/72842996243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+full+cost+pricing+in+environmental+sciencePDF 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_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 11088 bytes
SHA-256: c3637671c3f353c2c193bd18a9c3695e397d926b9bb7a2467b04ab77136b5487
font_01_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 17252 bytes
SHA-256: b06feb9f141249c991f17fd13494338895dd319505145412effff288302b18db
font_02_sfnt_off00014de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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