Malicious PDF — malware analysis report

Static analysis result for SHA-256 d801a91920311809…

MALICIOUS

PDF

119.9 KB Created: 2021-06-22 14:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4e2b4674a6072bb01ea1b102e8b5c47e SHA-1: 22258d9c52503b51377e25bd76ac1ee74c700aaa SHA-256: d801a91920311809fcdcfd43a2e702d363895186c67575cf2d7934633b51041f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c898c24ffa---besirexewired.pdf In PDF document text
    • https://communeouchamps.fr/userfiles/file/27146114417.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/778401986.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zukubomumasebejub.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/zomutazuxaropazi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f733211f---rofulotudowoxoben.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/motik.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fc220e0c4---vajekokoxa.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbc88e4c46---96676701486.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719963dbe0f---xiwikik.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecfb8b4a38c6daa895f138517dff2e9f/31996387901.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/lirubixabiguwaxukonesaj.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8f47ebe8---rewug.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e32283f36---soforumivuli.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/30030378545.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/13677305786.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/l478kenbbumqh6c65spgc570th/18039653822.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/bizugataxubujimon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=111+iq+meaningPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19931 4784 bytes
SHA-256: ba042f242ba3d162671f56a7a168ae303265f21ae49646c00f870b782a8758e4
font_01_sfnt_off0001a96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A96A 11948 bytes
SHA-256: 506c6b699ba4dc3c00ae760588d800c1c20ba6fde9322e02abd8979fb92eb027