Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade0085b10953b4a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 06:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c76ee24edf2d18bd8d9d621d000fa4c4 SHA-1: 89b8dad38d07cead3c02780c232f5acf9d4bb536 SHA-256: ade0085b10953b4aea9d9e43a4f9490bb5bb70b8bbeb848506a050ad457db7e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=windows+8.1+enterprise+product+key+64+bit PDF link annotation
    • https://tonerihned.cz/userfiles/file/zogaven.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd4deed2e---tomekudafakizukaner.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16146303e4d06f---79962384344.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210902120047_1970994525.pdfIn PDF document text
    • https://comfort8889.com/upload/files/34751624666.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c1db4cc8cb860d55ae7034f75912a09a/zevizatekumidixogalox.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/20184591699.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/92332290160.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161311680b2dab---zuwajefazojufazil.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210904172303100.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d065e08f---41128827183.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/61196676416.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/vulogasefapakala.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118091c0bb---bipowalid.pdfIn PDF document text
    • https://majubesar.net/contents/files/69416464274.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/19083635951.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vj1j8l9la5u9mfhdgdo6lkl8fh/zogolizemolorirotali.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161409f05ac909---fudal.pdfIn PDF document text
    • http://apicn.net/upload/files/runejibirixibutoji.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/nujidovage.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/kejudomilaxomokaj.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_off0000b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB217 15272 bytes
SHA-256: f9eee7f9c8cb6e9d8177b167b72994701ca31d57f65bd9ed621ba8b315ce8588
font_01_sfnt_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 11396 bytes
SHA-256: 73ee2e46c10e8eb713e112632d58664ab0fd18c995b2d76cac1fa3da4272f796

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