Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ce9269f50d6e37…

MALICIOUS

PDF

84.1 KB Created: 2021-07-13 23:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c352205f938798f41d1a1bb1d078668a SHA-1: cd2dbdedea0f651a68f8e1467fe7c49e77d48b12 SHA-256: d5ce9269f50d6e37634965a32ee817a9488af107768a49ce7e7786e2552c0c26
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=tyr%27s+vault+puzzle PDF link annotation
    • http://driver-jazda.pl/upload/file/1226647244.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/dukupezegofemut.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/xerotifuravepe.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/78536397282.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/81b348415c677e2730f966fd3168e065/muvoxorazuz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b61b1589f1---mefojazogonusowarizo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e89bfa2b0a0---xupumipidisur.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a48785c0---gisegisirogupagemunom.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/15946517038.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/vegizadizowuliri.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/93768c895f990b16610a18a40ac42f11/depezuxijitigoxubolovikep.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/pewejojoduwadapud.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084054c81c8f---xetegutokaxeteg.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dd36cad6abb706385e156ddde1055f2a/rejobiminitudazumod.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5fe9g3d8pdnh7ipdn1sfaujdmu/lumadabav.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e568d0f254---lukaxu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/bajonobalaxad.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/0m1hmf2i52l7kvssh4hos0bgoi/mapozipawagimawipufa.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/22523235019.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d94089ca---83986807463.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/zofukoresamebomojaxavu.pdfIn PDF document text
    • 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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 16316 bytes
SHA-256: 7a57e976b7aac0063269e915a37ca546c9ae6c23edef6670685c73f03dfe8edd
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 10264 bytes
SHA-256: 3c2839334145800bfa43eebf139633f3f60524bbc357bb21c306980bfb08bc9c