Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6cf6152da13f1c…

MALICIOUS

PDF

77.9 KB Created: 2021-07-28 00:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 601539cc4becf257853977810b8b5f46 SHA-1: 76d62909fd9adb23d73fa85ae011df99ba9006c9 SHA-256: ad6cf6152da13f1c4bc8dee98904065cb8450fadc94874bd2bf9c569478756af
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress uploads and disposable hosting sites, a common tactic for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://candientushinko.com/images/file/64020523495.pdf In PDF document text
    • http://cichanski.com/Upload/file/25330109530.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2fa5b7f71---32139863836.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/93930944427.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/31407369712.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/67681765752.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/jivexurup.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baea9c81f92---71403316215.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/xufovula.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a4587f8d---9820049538.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093661433306---68856194168.pdfIn PDF document text
    • https://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/funodufotejeg.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f41a682e08---4123618946.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C8EF563F455.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ur57hsapk8eu8vh5r4d6i1o6ji/91403440508.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/jakumonu.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/96806105047.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/oae4v0j9iebm6o2eecqhqivq57/saruzivodafiz.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608161bb054f1---13339360666.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/95edbeca0e66cd73d7d19a087bd5b24c/wafifigowezakoxivuru.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/batemareradupenex.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/xezowisu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079958e79f76---25272640219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=is+affidavit+necessary+for+i-751PDF 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_off0000ce8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 10824 bytes
SHA-256: 07820477799426ea9e9fc3aef66b26f4d1cfde5af250ed1940b0d95f868d0c3e
font_01_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 16072 bytes
SHA-256: a1d3106b5a8dce5bf74e0d2e8ede1c26c1166c5c5f754471497cdfd7f882f578

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