Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1d584b38d0aeab…

MALICIOUS

PDF

99.9 KB Created: 2021-07-08 03:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dd261cac8f097734024726b11d26c9c SHA-1: c84e6791cece886838a7b7deaf896d4f42d8dbf3 SHA-256: aa1d584b38d0aeab6dc8bb9b3a2d348c166b6f6942361c312979d036cb9369bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://guides2alpes.fr/uploads/file/79499012002.pdf In PDF document text
    • http://amirafouad.com/uploaded_files/file/32586547359.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/duzigunidegaleduzeluvi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5e5145e6---bososab.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6d14885e---34484880639.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/sumekelalaz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21f3f28d6---kidupaz.pdfIn PDF document text
    • http://change-sexy.com/files/files/durewizi.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/kavobog.pdfIn PDF document text
    • https://togeltop.net/contents//files/wunafakoxavafe.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/63992118186.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/75407577463.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e30ff70e64f1e458ff875a379fd89304/rugudasewuzos.pdfIn PDF document text
    • https://goodline.by/userfiles/file/sirinugegavozot.pdfIn PDF document text
    • https://atl-50.com/files/file/tovularafimitefinojodoxob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef29ee1cd---54335628804.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32d1cb626---wamevoligikifubafi.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/nesekij.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tixigodinajenojaxosiguz.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/g8vpv2754phml7nd0lsbe2mvk8/48309640477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=glazing+systems+specifications+manualPDF 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_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EA 18144 bytes
SHA-256: 7967c0e770ce1ce1742937c8cf23cfb8a914a893869b502e800dd43f20077b5b
font_02_sfnt_off00016713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16713 11036 bytes
SHA-256: 9463596eb3f6b7b8b8f4b79512bb7bc6f567509ca9f7d29214491934801a21c1