Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff35ac1a7eedafd…

MALICIOUS

PDF

65.1 KB Created: 2021-05-27 21:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 37e30f8b0555f02e4d1121d6c1badac9 SHA-1: 98f5a73bd1205500718e921e8deb691a268dd569 SHA-256: 1ff35ac1a7eedafd0f5b1eb022ab3c33c82d1103288c6631d6d456011479aa70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed for SEO poisoning to lure victims into downloading malicious files. The embedded URLs and the nature of the heuristics strongly suggest the document's primary purpose is to facilitate the download of a secondary malicious payload.

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://philabc.ru/uplcv?utm_term=qasas+un+nabiyeen+arabic+pdf+free+download PDF link annotation
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/052638afebcc55467cb4f4e41c8811de/31570067517.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3c91c93b63e7dd514fabfe3dee8dd4d6/90914604284.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ofa5bt5r6v78mpc376bs6pth6p/figemevonoxururirenovirop.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/49884786439.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/dozid.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gm19788abqrqd8l4av2rnvvb1u/12370462599.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774d9e47e83---tewupavabeferojelisi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88b22e081---97004729465.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/aa6cfcb3016316057a54181db50a344a/3071374903.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/fidopupebak.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vavkqabrcqicb9lue89qjahdbo/63145569731.pdfIn PDF document text
    • https://airbays.com/userfiles/file/93960100406.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/bizobapusugozuwaxegalife.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/50aacded63174c84719ff9392d3be282/bobegidipu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609294f75cea2---fubuwoparuludam.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/95962942086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 5544 bytes
SHA-256: 9fbdb1e49694eb38df7d9b2e03db9b0849d34900bd643dbea1acb9bf57ed5eee
font_01_sfnt_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 9816 bytes
SHA-256: d0e1bf0f82d02f50562fd2a72bdbf227963b44d22c8796cca6506b897b917f8c