Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcca4b21458f7a86…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 07:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e30e7915fa2392fe50b186a3d3f7fc1e SHA-1: 3d55ca76426161564c10f0780202c1786cf67aeb SHA-256: fcca4b21458f7a86bd469a48f07a12af4f10a47bdd1de235a30183993b251712
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

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 http://seednseed.com/admin/fckfiles/file/23194386273.pdf In PDF document text
    • http://mtecommerce.it/public/news/file/fefidi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/90dab9f32c081945ffe5d93935b807f5/79870676519.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/40900602763.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/poxile.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/xaluxa.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/pebijuzuxav.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/4157544227.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/8609272287.pdfIn PDF document text
    • http://coolscape.info/images/files/xofewuxejileleves.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6478df4e---99487953245.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/56141555458.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/39609044781.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/nubabufedikudotilivilotar.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/92429372165.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/rifikuzone.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f179663c51---65029166063.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/gukiboxitubinuzox.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0477c87fc---90657456597.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/foranefipebowegu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ec39dfe8---fedixonet.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147bd1f43074---54040175210.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/dulup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=take+screenshot+on+phonePDF 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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 10388 bytes
SHA-256: 8c277438dc7fb75d5ac2b1c05f685bf859bce5d9ce4113e2dc4b528af9d39802
font_02_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 17548 bytes
SHA-256: 6565873e42f47e24dabe2ee9d8f8b644b7874645a4a03e70834a55454c78520c