Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5819f72a5f84320…

MALICIOUS

PDF

92.7 KB Created: 2021-09-17 04:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d096d55c44eca33414e8dab87c7c7ba SHA-1: 2ebbc8b37e3f32f0e94534ac81a32673a93e1253 SHA-256: c5819f72a5f8432089002199322fc2b991a13c9fd5f2426a1394a8b3be59e5f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=emulator+for+low+end+pc+1gb+ram PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9fae4b7670ce69251262b694f7e9d0d2/tivub.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0277a5db467fc20029dcc4bcdb5c418c/16898384967.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/24565201867.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/fobufowebobizovime.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/35444738748.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/vafetirexedoxabon.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905161928.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/lomufu.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/55968470268.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/53e7c49a5ecf0fea942f4bf9affb5195/tojeboguvalapibadake.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/pamabaduwipavi.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/738e1b5795b3dd37b29d3b3043e27f65/77235463987.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///pogegawisunojukike.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/zasebazotosuwaxokexe.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/37028105817.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20995242846.pdfIn PDF document text
    • https://istanajp.net/contents/files/80536926774.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161421b63d4514---tesumikuj.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/1937488860.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/rakavekepiwaxus.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/81257638412.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/xewivonaku.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/69125700912.pdfIn PDF document text
    • https://ienter.bg/files/31566210765.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_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 11064 bytes
SHA-256: f07c1238c7d3578c19dd1fef18df0bb24d5b27b5a2ab6232907451b1baf7928a
font_02_sfnt_off000135ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FF 18304 bytes
SHA-256: 5aee9ff1385ca40ea62df290243e2919e69e28edeaade10043e385b4a5a5d066

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