Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdccb51fd7ff9a7e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 21:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0115f26d551d0192cb2372e531583ea1 SHA-1: 1cfecce47cb7665074d50ee84ee84b21d8774585 SHA-256: fdccb51fd7ff9a7e2ed6d987fac297731a5f575da65a5bc705d4f7ce72a32a53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to obscure the true malicious destination. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ahzycw.com/upload_fck/file/2021-9-5/20210905112540231808.pdf In PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/82977820697.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/tazuta.pdfIn PDF document text
    • http://test-immo.com/file/15748788522.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/73901627055.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/momeke.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/maregikenilemil.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/b8jbq4opu10h0mlpp6qkgkk826/37952915069.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/tufixisetatopebabuk.pdfIn PDF document text
    • http://mdtrend.hu/files/file/57706467939.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/99184866319.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///sebolagixewixadonetirolo.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/pivefado.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147c5e775ec0---53643029100.pdfIn PDF document text
    • https://oferta.lt/i/File/19655338985.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/dutinefodolarumu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/vevevufufewifiwu.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/87558314646.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/33189005478.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/dexariponabesetenosiwub.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16146b0ab450ba---mumajurimagulokotoruga.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/7455013709.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f56f81a7d---nujovet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=psychology+textbook+freePDF 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_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 17428 bytes
SHA-256: 4af8f30bd874f9cc54b99090035c1d12c6c16407b2ddb0ad989e933fc43e5ec8
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 10704 bytes
SHA-256: cf017c99e81417640731bcc04337ffc76c21ca0d4d5bfaa6eac416b7ac0ad7c7

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