Malicious PDF — malware analysis report

Static analysis result for SHA-256 93518afc2c7988f6…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 09:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 187bd5db6ec39229ebc4d287bdd9c311 SHA-1: d429c673984f531473e995a1b2c87c9733715c67 SHA-256: 93518afc2c7988f6b1ab25aa003524aa37a307566f722a7eb5be9905053875f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of external URIs and link farm characteristics points towards an attack pattern focused on redirecting users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=best+cryptocurrency+to+invest PDF link annotation
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ed06cd6c4---87670938567.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6b194640---tujid.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/66240433167.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/65157488476.pdfIn PDF document text
    • https://yellowstonewildlife.com/5132860801.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/89689468937.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/zapezokadetikegin.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/12103208343.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ed647639fc026a774bba0c9d87bdf2ad/28969953020.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/fivulusipujal.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fff881dc---dokoxixitowiziwelidukofi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe40d589eb---393069488.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/29581109960.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/7685433948.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760107da737---fuzurirajuretexutimujol.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/vetuwemoxetixewupuki.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/29675491246.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/50485303291.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/487aae4fb780af17d28500ab13a126ba/10830552414.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/40141465354.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb191d3a4a5---netadizuxefomowabisowem.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1627563652190210982.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4ceb11e1246360aecfad67cb5f80e559/48805991379.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwalapogozelu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 10492 bytes
SHA-256: d92f4dbc3c499b3d21a3edc41c193b8b922134f69b1caedb834419b0763a4a12
font_01_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 17968 bytes
SHA-256: 858523ccb50303ac8cf02942b7bfdce57810f5908c4f06a879dc57e1586c01f7
font_02_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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