Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f5685d705ce392…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 21:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5cb84a637d724b18459f108e8691e0a SHA-1: aa0f0a9ab088fbc0d058c0dbc896f127a59ffcde SHA-256: 96f5685d705ce3923fc131e88f9f79f24ee5ef6948f813d8fd2fccaac10427b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://krisoc.ru/uplcv?utm_term=binding+of+isaac+browser+game PDF link annotation
    • https://gites-les-bardots.com/userfiles/file/55284475298.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/vemiteg.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/25351291881.pdfIn PDF document text
    • http://shahgrp.com/uploads/44123251668.pdfIn PDF document text
    • http://mutitar.com/user_img/files/batubemezi.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/xamigotafubazusaw.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/60971699785.pdfIn PDF document text
    • https://cet.sk/res/file/sumame.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/65400938977.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/21142270180.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/karitebenigegalejerove.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16134939888a9c---ratota.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35149689861.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edceb69643---nogijukukane.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328bfc2ea40---jevelinonit.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/29282040567.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wefuninutafagedixatati.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/84095158303.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/65724753947.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/lewemeninaxib.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/pesavutumoju.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/tawadewudad.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/nepozikezo.pdfIn PDF document text
    • 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_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 10952 bytes
SHA-256: ffa4f9dd6fada6cfbd2dfceb9b958ee1b660490a8508b8fa935bc8c2aa520283
font_02_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 18432 bytes
SHA-256: c6b2b23715a3d01e282c7d37fcdfb032d7f68d8ec723ae04ba3e813264f2f648