Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cd485ef0ec894b…

MALICIOUS

PDF

82.7 KB Created: 2021-06-26 11:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c8000570c4626da91774e1ddd9fa4dd SHA-1: cde1f5424e10cbbf7d2aa0641fe420967a30e6fd SHA-256: e3cd485ef0ec894b99718a1f1f3e6d827404111831442a0662550bc06e6a9a86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability to execute code. The file functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple distinct hosts and a high number of links per host further supports this malicious link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.dereformasenalicante.com/archivos/files/fegoxomaraz.pdf In PDF document text
    • https://dacinsara.ro/fckfiles/file/dologokol.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ec3cf5ea1b97324ccb5eeec68ce483a8/kotebunilupuzomopowu.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/30926043710.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/20759106826.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/30c8732ed14379ec39cc2497650cbb57/30843958159.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/poxelufenol.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/62b962554a9ae7ebc4639599d5fbb18c/36750955576.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9923af5a---gotumifafosuviwus.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/ragiwomemiviseguvulupe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/425c70052fcd8c3b38f67168e1d8e189/povifisurakigowimuzum.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/vetisivulasuragunomagu.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35a0c634---66875571926.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/duwatifixexemunabu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c636a2556def8344ee7b39c5c7551bb2/vifaroxotuji.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/dbaf637bf08cd4330975a67bcf27f73e/gigidiwevitowutexav.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210624021813169.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd82647781---gotunaluzujosub.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/818ee34fc9a5e279be564edb7065c9f5/duzobefaxawidaxiwex.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/82865537779.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hg8k0cgng04ej460k0ifk2hph6/72093920119.pdfIn PDF document text
    • https://nadamasristorante.it/file/ripowukoletu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9ec72fcd6b013029fc8130ed36aa5754/69269054524.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/87173361022.pdfIn PDF document text
    • http://belst.by/upload/file/vajawasenufutoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=9th+science+answerPDF 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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 16832 bytes
SHA-256: 4116e4c59bc679246faa38012066f6374f02a97f2525d2f527c7a887a207e63e
font_01_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 10316 bytes
SHA-256: 6bae8899b9cbdb4bf7d22bd473f99155d4ce9ec6fae98d37a1b149ff505f405d
font_02_sfnt_off000125cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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