Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc5f36753a4f46d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-22 09:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8c9028fb2a1f1b1c8a04ca655b55c67 SHA-1: d5e419e2c2d8d5473b97cdd838a41a6812b8a7d7 SHA-256: 5cc5f36753a4f46db7cbcf09b36fe811d3221508e04fc37195235ae7c25889de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://windfreeklima.com/upload/ckfinder/files/54784874795.pdf In PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/wuwujugozi.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/xalozudota.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/96425224296.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/vibotenufilax.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/78779215721.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/73315593432.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148cb0b77e75---wusojedirawa.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e71f815eb3723e2469a5d1dca4b553a8/63034088864.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/powemimosozelozuz.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/7165931419.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614229764f06f---bibozamarove.pdfIn PDF document text
    • https://reniuved.it/file/47408293085.pdfIn PDF document text
    • http://synphabase.ch/upload/file/79423347106.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/21788536484.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/polapovabegakozizimabe.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pegakebaxaketopagej.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/defexibixusozipazejubi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/072a560b5eca18d0dcdb800c4a4be1dd/fixaludasamub.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/417605185613a9e76d9de1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=change+text+font+size+androidPDF 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_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 10780 bytes
SHA-256: a605382091ad1c07f25acd878aa34d8084c685acc14431686b4758a00c55e459
font_01_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 17768 bytes
SHA-256: 0bafe05b6093229a37792495c17e9c85c7694a64a853449fb0fa5b9687bd8a6d
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1