Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef61b2ffff01d04…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 16:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ead6a3c41f6218bd9998cfd1982be54c SHA-1: cb550af561859180fe915560c0abf6f9e920a930 SHA-256: fef61b2ffff01d043918472c502c00e2ee2afee3203c847b2ab1571c00ce847c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=how+to+retrieve+my+iphone+password PDF link annotation
    • http://mkngsp.ru/upload/files/rexiwuborerepigaloduguwe.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///53926725420.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/gerijenix.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/wanakisalijujizaba.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/sufodivavelulewajeb.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/63e74018c7715de9ca70755042792c24/lanebusijijepamop.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/56814679385.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/bumubulokijizopa.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090305580473499.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/dibobamalukiji.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/magexo.pdfIn PDF document text
    • https://506hlapeta.com/files/file/nazosegugadorebunuwu.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/12107659800.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/31595962098.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/39020961325.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/29606767663.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/risawirij.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/16641737029.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cf30f18b6e81185ad9ef860bd401dfa5/wunisexuwabafijewazixaz.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/rupamobaxezowe.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/56233395689.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5j04eg4muqcgnuiqsv36lfcin6/bikiposi.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_off0000bcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 16184 bytes
SHA-256: 0bc65ac083c7dafd973b780ae5bcea7b9e9c2c9616158283092660a522800d6e
font_02_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 10868 bytes
SHA-256: 8d3f93066c2898c0be4cddb1d70c2de59888a3baf397f65af81e03545b8849c5

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