Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6b61e8dd2211ea…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 19:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4809e42c74e92f210d2418c9d04f6dd SHA-1: c6323931d38068fdf3b3d358b3b58b1c8511e123 SHA-256: 8b6b61e8dd2211ea523a20ee73c8a8a46a405dc492b8d2aa36165dd2b94e8020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit PDF vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://cissud.eu/uploads/ck_editor/files/refezusapoxojopixosotig.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/pawosilujaxukosoxoji.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc26909201---xutisolodetibidiwevav.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/womomugadek.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9784ad31fd---8878447064.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/wobujoba.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/82471756227.pdfIn PDF document text
    • http://freeski.hu/freeski/file/rokovepovedanuziwo.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/d5958b6df79c0bc095ee53b9aa7321d6/vulugizo.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/67540681952.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36da09e3c---44464790380.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/nozunuwazisak.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/79336638251.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e793a0af2eec2c5540df4c0a906e4ee3/36283578130.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/askcnpo0a9kfi93jqv1gvrlgau/vavegikeguzi.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/legujowefanividukoluruka.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c094fa7b06f---lomizukareraluvalepewaxas.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/97069475742.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160db85bdab2d2---2727107054.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/nobisafizuvedobu.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/10565819082.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xufudipawotes.pdfIn PDF document text
    • https://ubranni.com/uploader/files/87198341220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kumon+answer+book+level+g+math+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_off0000b806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 11328 bytes
SHA-256: 3c8821c8b2b91239458f157a1c45bb0b351675d1a4c1437d6e241d9c3cccaa03
font_02_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 15128 bytes
SHA-256: 79245353d607081325d6dfb5c327dbea30dc912796a88cab5c313da228b04802

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