Malicious PDF — malware analysis report

Static analysis result for SHA-256 411726cd956535e7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 01:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e876b3c947636a42cbae0ac17d12ea73 SHA-1: 14f6bb32de6387614842efa60cb59fb55a972d5a SHA-256: 411726cd956535e7aeaad8862ed8001284964c5c48f385881570d3aced3b3a05
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. It functions as a link farm, directing users to various PDF files hosted on potentially compromised websites, and includes a heuristic for password-protected archive handoffs. The document's structure and embedded links suggest an attempt to trick users into downloading further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://holdemigny.fr/ckfinder/userfiles/files/65586627642.pdf In PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ac9b9bd05d408e34726cc3c2529f6c36/satimedopofod.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/9877215664.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/46761133020.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145bcee2d695---97195380716.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/magowuvafizijani.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/vilojapaligefokigilij.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/78659465896.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/temojinajekaxopadesatenuf.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/dufaso.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/76339034581.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/munumoneligivilonafi.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/77599180158.pdfIn PDF document text
    • http://wohntraumgmbh.at/sikafarimotugi.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/pajonafutufatosuvaj.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gobogixa.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/magugajapoj.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/gijerolilufobasuxo.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/nifaw.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/94707026553.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f44ef0395d---18471965171.pdfIn PDF document text
    • https://taperagi.com/contents/files/44307511121.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/19757672475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=administrador+de+dispositivos+android+ubicacionPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/rizaja.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_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 18888 bytes
SHA-256: 288fc3c5595806ef2474edad50137f5c3443f91cc0b0a8af9c4bc9cd3452ed84
font_01_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 10916 bytes
SHA-256: 4ab678add6aff64ec4a39aed8d7747603acc1e27cd5c7ee95278745acb0ba09c
font_02_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1