Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4904a8202f721dc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 13:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a47a0bdc5cc14786c475cb6df60d93ae SHA-1: 2d889c4fafab23a4add53fab9ab7b6e08cc8f929 SHA-256: d4904a8202f721dce4541cceb8a0d9658de1c0ee0b84dda8084784f2e60c845f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to malicious or phishing content, likely distributed via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa1c96f508---29330353434.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/wabalolidizit.pdfIn PDF document text
    • https://promise-land.com/upload/file/patowagebakekoxegobo.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/25041171990.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090219005272.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/56503309524.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/28030047746.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/kovorokizarup.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/kukitomodenopekix.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rukekelopavosineludo.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/15357725616.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/82029624136.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/10c08ca254031accbed90bc58fdf2071/mugegusedewuridugemu.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/81836515358.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/neteje.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/72638117796.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421bf06e17---jotoki.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/pofazuk.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/morujowasewerixuxukejojo.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/junenaturoromapizugifu.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/xedoxapobusumixojab.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/bajivotovat.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/82907072323.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/11904541623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=purani+jeans+full+movie+download+in+1080pPDF 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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 21340 bytes
SHA-256: d9799e250ed8c3d8f0b46a75a7cddf2bc3b74dd13fb481db2ef48813e264acf4
font_02_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 11328 bytes
SHA-256: 37e51112fa1ba1b524b6164f32b55276acbc661bf79f85881823a67d4c8083be