Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c479b8af1fabdc…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 19:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc4b8ccff343749c375a28bc37360324 SHA-1: b26032286a50f5f9b48a68148a049aa6edf365e0 SHA-256: 18c479b8af1fabdcfa9f80d00346c4fc594af5bd67a8d25bf734ef18797b8e73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=differentiability+of+function PDF link annotation
    • https://siam-royal-view.ru/data/files/povemulakefelabuxinulir.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6033d6226---tefopazuvovewuwewoxoxes.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/zedigiwuzajugufa.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/kejikovukuradog.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da480bdab---fiwafujejatofevu.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/ritij.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/49429053985.pdfIn PDF document text
    • http://denge.aero/upload/files/winodipasofulo.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/71992911594.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/tujazaxosuma.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160acaecc710d0---62001106882.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/r8vtdctf4nsadnuskl4uksqh9d/98933447299.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c71a55e1c13---53476308581.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/28195905074.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/gagodorizuxalikajujole.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7e0028165e57054ec43937da34ba1403/5170070132.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cfc9e5bbf---71054503225.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1f16094f---fokavofemu.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/90217989848.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/38971150024.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102de1dbb2d8---41919475407.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f12f3bc19---momowodunigexoxogat.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a07c7c7016e---5492191474.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/nedewarerilamalosojujasow.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_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 10516 bytes
SHA-256: dfb2e0be4aaf0a120d44af09b9bb1df2c6e475b071c0397f1d766514296550a8
font_01_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 15740 bytes
SHA-256: 79d4ed17b0ddffd00396dbcc123a9fd98fb39541dee54a7afbec390195a58641

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