Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fd9d0fa46e2d8c…

MALICIOUS

PDF

89.6 KB Created: 2021-09-03 00:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c844ba3a0f2c2c1edeb981d828ba768 SHA-1: e78d90aa4dce7b89dd1ba1fe97972ff01c4fbd7c SHA-256: 53fd9d0fa46e2d8c212fd50b69037025658d27e50b11bffc8a67e52713ef0982
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are typical of malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://medvor.ru/uplcv?utm_term=yoga+vasistha+pdf PDF link annotation
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/af002bdfcfb1673139539936d1b2afd0/lolikamolu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dsf3j5b1sisgd09kriaal70r2t/gemoxi.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/31944241869.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/37785461691.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/xatulejugukalikolatiz.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8607b47a5ea3177a8ea5c21b1d6751a5/4866588185.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/28841280210.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cbd33081d5c7c89761fdb44958df7f3f/xesilajupevagudufalu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e8abfa4f---90788912626.pdfIn PDF document text
    • http://www.heksan.com.pl/file/5932454236.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c5c2dfb6---melemogujixizux.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/63441f0714a8ce3f5c41396bb0d39de8/9900266788.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf308d87c12---netunezesofowivudebediwun.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bccc8d2189---tapimosusosakujasifaroxa.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624623877mijomivikiwi.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/42281755887.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/44220889804.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9d12d3691285021f6ddfd8ea30e53ee0/33976579126.pdfIn PDF document text
    • http://w-mill.jp/images/file/76466740715.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/81742342223.pdfIn PDF document text
    • 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_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 10444 bytes
SHA-256: b72d323a544e290d77e55ee8b564e81036e1f559358a84aecbd9f8615401cfaa
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 19924 bytes
SHA-256: 5df95042a0e765e2fa6ae5b05aad4e7bfea032814c6128a9e916fd021664ef3f

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