Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d28efca3d71b1a0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-14 03:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c19966cc5e18aa201ab6f3c7684931f SHA-1: d2a0516abf7358ab952f3ab7fd9ccecec4e98635 SHA-256: 8d28efca3d71b1a04361b4b22a5172d6b68bc11b7efd0c55f72eb7527b1fc647
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bantinnhadat.com/users/files/nosapim.pdf In PDF document text
    • http://rrarental.org/upload/file/sebalub.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/volawiji.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/najifepizagibovusogitepi.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/4350095221.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/xumonejeganot.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/70616ccea646de1498d0913e3af0bc27/febogukovuzumenogumejetag.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/nafowekolefunuto.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/55976758867.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/57154567301.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f7fdc7317---kafaku.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/tidikomegugukiko.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/84898800520.pdfIn PDF document text
    • http://vititanon.com/user_img/files/zolamusezit.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/jawadajobuxubawe.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/betekewuvuxe.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/47181486901.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/zokebozedixejizebonakul.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/15203776234.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/muripugabizixizowek.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/bamexuxagaboxidibawewejaz.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/99829638069.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/24e0947dcd56ed9f1fca120a7c8fae1a/sakipem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=is+spinach+good+for+eyesPDF 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_off0000c583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC583 17228 bytes
SHA-256: 3d4b890c70cd16f4d7d109d6bb7d22dc63dea387807eb6a3d12aaba080139c89
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10820 bytes
SHA-256: 04a41e6922a06d7d7b3b9be20df14bced9c13321abcad321af59dadec5057380
font_02_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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