Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87d86e673538c39…

MALICIOUS

PDF

97.4 KB Created: 2021-10-04 20:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61828a2563cef0f6724c93dbadebf165 SHA-1: e71726da82da7f8a06ca7b8b44049ece7adbcc58 SHA-256: d87d86e673538c3971b76c13eac1afd650557588ed56d9ddaa6308bf8453d3b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that redirects to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372359ad351---luzofukojobulamozeji.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbcf5dfe9---10745916568.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/wesijive.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/kakegemugotosiwo.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/bofabemagopaninow.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/63416508402.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/8356787644.pdfIn PDF document text
    • https://kopari.hu/files/file/23538033176.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/a9040878e29eb056e0127670240b6b39/nakusofakiwopotakalodot.pdfIn PDF document text
    • http://thietkeweblongan.com/upload/files/vikilitanudepowiran.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e8381be9---fisubaxiwejogarifofuloted.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/kupobumapa.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/5593900969.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/51040476337.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492367b3d6d---lonakasitepaxebidutezakim.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/39657944183.pdfIn PDF document text
    • https://hgb.se/filer/file/laburexibibugaw.pdfIn PDF document text
    • https://mauspro.net/upload/files/9008219532.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/lerokogemozavanesozerimi.pdfIn PDF document text
    • http://premo.at/userfiles/file/kimanaxexogekiwevizi.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/xamopab.pdfIn PDF document text
    • http://trivio.it/userfiles/files/17866076522.pdfIn PDF document text
    • http://ministerium.pt/files/bosekanudiwe.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/67229761556.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/gekodibikomuron.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pufunubirezoliza.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/sidogexogax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=artists+their+lives+and+works+pdfPDF 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_off000112ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 20124 bytes
SHA-256: 5947d9dc8859014aa45fd9a0c048b558a093ba21020416f8cba167a48f9d1b73
font_01_sfnt_off000146c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C6 10820 bytes
SHA-256: 2f5971020eb1cceda593e2d7d23c6b4d5e5d8bc375dffbb394c7f655639409a1
font_02_sfnt_off00015fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1