Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca13e5d7be555e2…

MALICIOUS

PDF

88.6 KB Created: 2021-07-25 21:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7f9129b17accb0f9c149d3f16a32107d SHA-1: 1beed4a5142e71d2d6e3e52b7807bcdf537d9b99 SHA-256: 8ca13e5d7be555e2b5f99d0ef1af3f79a47bf5041b1f5ac803077f306d7ba26a
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 and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through phishing or to deliver further malware.

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 http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607448d391d4c---24569319962.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9d4f75ef1---84158574470.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/jejulipuferuponez.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/90881011207.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b7501522a---2610229076.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160858646f41ad---voribef.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/36432825659.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/8180063446.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d2667108693e7763207392b80eae114f/43456150095.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/525ced270330dad2e019042aee9d91e0/xojelomu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18888392142.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095094a2371e---49710254113.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/wubimifagavovijeg.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/57377516022.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4985bcbd1891cc1b275ab142b30947dd/97945111380.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f215fb9bdf1---44361369901.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/75856425820.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/94658041023.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/kezidawobukidideba.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6dc778af3b46a1955105c36afb78cabc/wibovalaxewebu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae445195cd8---farokasawoneluna.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160906b3503f81---11974172723.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/1138361458.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d98be104a---57129625262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=relative+clauses+with+determiners+and+prepositions+exercisesPDF 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_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 11176 bytes
SHA-256: 4891ddb07b37d0b6006ef0db146df8b5bb89c16474d45ac542de8260cefaa39e
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 17376 bytes
SHA-256: 6b07426692976215658c90cc88503a7b1c070b2fbcb16a5cdcb1d7ecc80774ee
font_02_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1