Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b619249d419a51…

MALICIOUS

PDF

85.5 KB Created: 2021-08-12 09:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b2f5f5258bfeb31c0f2840c74685c36a SHA-1: 7ae9e02881fd0f3d0cac4a2f384d4a4796c8003b SHA-256: c6b619249d419a51c6cf7460f395c2c917dfd1ede0399d3a046d822f19d43703
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is unreadable, but the heuristics and URL analysis suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/fc6795a404798c9a23bb53f323155065/6812499657.pdf In PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/bibaden.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/2915156100.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/83121844036.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4774848a47---xuzidarasojejo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/fonorogemivafa.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4545ca4e1---dixexigamurudojevolad.pdfIn PDF document text
    • http://secretinvitation.net/images/files/15799472525.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ec973076---zuxorulasisi.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/bobepino.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/5qrpur2supu8pjqlichov410ct/xujinapijesevaxilexoganu.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/4g00b29s9t0a31ifind4t0dbbq/folejitarikufon.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/21869884515.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f99801ce74e---turuzewirusus.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/252c509d5e5e638ac65511ccf73b77e3/99419549105.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/46d946dee3caecf82434a60d60a7bf24/sadalufelezug.pdfIn PDF document text
    • http://vce34.ru/attachments/file/semaminewuweman.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea185f9e5---rezobo.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/161d6d14249d20d1f2f937a9b1fb40f5/setesatejufiwixuse.pdfIn PDF document text
    • http://4bx.pl/public/file/12694431463.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/34215488324.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/texobo.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/22949939264.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/25388446105.pdfIn PDF document text
    • http://babamoleskine.com/files/file/lidekozobazuzurewafav.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/90638573593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=on+peut+trouver+in+englishPDF link annotation
    • 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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 19008 bytes
SHA-256: 58e044b963416357de93e3324bd486686cb69f50a461559ff19e3258e7d4656f
font_02_sfnt_off00012eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 10560 bytes
SHA-256: 041d1a0a136cbbadae8d507b18871593bc1a364d20784a6c8504811362d9dc27