Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6e12d4754657f8…

MALICIOUS

PDF

124.0 KB Created: 2021-09-13 13:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e5782449a842d5d8c3d3b57e34a30d7 SHA-1: 62b0d5dad6e45a6213e04076de95a1cbf59437c3 SHA-256: dc6e12d4754657f8a334d785de185c3e5c67edc7c6b3451c07f077015b3c7c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://scamps.biz/userfiles/file/37120591200.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161376b337fff1---1359049430.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02b695c8d---21544337003.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/96386257558.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/fegirakune.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/buturovopelosezum.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/japazotukoloxajonolonunu.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/92515780877.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/9736367364.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26deb8a79---zalepamilarupoliketogeg.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/37571415228.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/911fu245ffe4ml65c85tjhbsea/86216950001.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/wusovegobulabakubukiv.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/bizufanosas.pdfIn PDF document text
    • http://weingut-suppan.at/files/23509122695.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/wuditimimagibafosowadeki.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/xamasoro.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/56734205823.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/45405048815.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/toketu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d89b2d35---11778353012.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132493967792---27945000642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=otitis+media+with+effusion+pdfPDF 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_off00017fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD4 19032 bytes
SHA-256: 8c0892f1ebf44134748f9104990aafcbf67dc958ff687f22fac3dd619b1e1832
font_01_sfnt_off0001b17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B17A 10828 bytes
SHA-256: a23400e36b3057b6f45d27b80e5b3dd94e53664851584e3947ff3f60c0f69c54
font_02_sfnt_off0001ca63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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