Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d91193bac9ddde…

MALICIOUS

PDF

93.5 KB Created: 2021-09-04 21:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 05f5fda3abb245e5ea0cb2a837e9bbf6 SHA-1: 899484efa06c9bf90e64ebd9e7a179a78eafd89d SHA-256: 56d91193bac9ddde3b0adcb1eb406cb49e785cb9c1df10ab045ade4057b722e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to redirect users to potentially harmful content.

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://seeyounow.net/userfiles/file/bafasunudamudedej.pdf In PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/37117833528.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/1471015149.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/69f2c59c4877f1a3fa9e9d0b0f6ba7de/5821539771.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/69111647319.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/bipulidedadejipixufe.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b49b56d0b---vizidakesunanani.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/gorexenufabajaf.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/97475201764.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/bazepow.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/82779557534.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ead646a587---lolovetobexonup.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/78072033970.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/tebojel.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/35f71a04a3b1c6f9ffc0926b2fd08731/49638548160.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d52c6e27---budisonevonibigajugat.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/voroj.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd58ae28a8b---41374792214.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/zipetenurejeluw.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b55f6849b---31917204383.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/rovetefuluwowis.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079107d2a93d---58580489378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=modes+of+dissolution+of+partnership+firm+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_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 18412 bytes
SHA-256: 09dd6e7eeec38e3fd3c95c94af746ca8c43ef9191fbe3f375b4341a3331ed182
font_01_sfnt_off0001372e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372E 10856 bytes
SHA-256: e0dbae2860239a592525ec7db775c15361ad26ee2b795b002b7e2fe7adf74777
font_02_sfnt_off00015004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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