Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9af0bd41561abd3…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 02:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48a34bfe7099a78b49d1f78a448f75c5 SHA-1: 60039c2af30a32e2c7dd9c2779c0aaf494c28057 SHA-256: e9af0bd41561abd3416c3b5f94250d3a12d902cfbb433abe95bc6f9606161071
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to disposable hosting or compromised WordPress sites, forming a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links, likely for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://worldofpacifiers.com/editor_uploads/system/files/36441835206.pdf In PDF document text
    • https://acrgruppe.de/userfiles/file/94355553973.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a238806063---tufasilupiruzuxavudixe.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/40985398524.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/50175167710.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/79530854765.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/junibo.pdfIn PDF document text
    • http://kag.fr/userfiles/file/zilumevibepes.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/95854049972.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5fee0a906---82580605808.pdfIn PDF document text
    • https://cristalensi.com/public/File/31171306143.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/sogivozituvabevuse.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/jolenujunijigagisek.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/68847648606.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/lulibejufigim.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/fusovidimabuxitoronozo.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/volexali.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140629c0d994---79691585360.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f72eb5b3---21925768304.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/sutadadewujodofeso.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/69591462071.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139370ee8030---pegewuzenogomize.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/rosopoxomaga.pdfIn PDF document text
    • http://imoroz.by/upload/file/tapukegobatisafibakow.pdfIn PDF document text
    • https://oferta.lt/i/File/44831259638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+pe+new+versionPDF 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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 14516 bytes
SHA-256: abb913a5e3285055593cd025b17d0eb72dd9b4436e77e8bedbf249d099e4f9a9
font_01_sfnt_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 10572 bytes
SHA-256: fe87a28f4b08857df03a9b55e123cf3aa3ea1eb0ecca921692eb7552ff207461