Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17526d369a4d769…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 18:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 521d3cff7e52f9b86bf51ea40adfae25 SHA-1: ec7f0b766cb69ee0eae8bc141427607623bcf05a SHA-256: d17526d369a4d769c9eb85bdccb2420943f9fdc3fc646f2661a5062820e49644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=boreanaz+seal+team PDF link annotation
    • http://geometrarontani.it/userfiles/files/3105072439.pdfIn PDF document text
    • http://findacommodity.com/upload/file/22157111870.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/63020247535.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/23366321631.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/84347476981.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/mawipavakiva.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/46105435617.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/5601694999.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/40619197377.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090300123052.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/dekibazixaberonujere.pdfIn PDF document text
    • http://techmechengineers.com/uploads/gujatukuduret.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/23978207423.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f86fcfeba---46592395384.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/86049146967.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/fipikas.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/35251941207.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8d9730df2---bijojawiwozaxijeba.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d87170da2---duwurejitom.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/89538134346.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/vevipupijawag.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/16776354758.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161425639dc7a7---55871949132.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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 10288 bytes
SHA-256: 6c0cd884fa79d022de07ba2a94d7f13dddfabe7a00c62c561f8614dfcd38039a
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 18188 bytes
SHA-256: aa6ed937230994d941dc87bf5f495c57754c314ca0ec4b59ec2c355f30586627
font_02_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1