Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c330067e2e7235…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 08:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dfbb85361188e38c2936a08a9140e24b SHA-1: cb155436513a7b8dcf210eac78513401012cbf84 SHA-256: e3c330067e2e723562908cfbab0faecacc698fbb3d4f58cb2c56d0da962ede9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the provided URLs, facilitating further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=123+free+films PDF link annotation
    • http://softtox.pl/new/userfiles/file/xorasureruwopu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/vuwolalivezevufajifutaro.pdfIn PDF document text
    • http://wenxuezj.com/images/File/972927693.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/29761735732.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/50ebf5b693c04305b9392a285f24ecd3/dejonupavozajafaroz.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/37702051532.pdfIn PDF document text
    • http://besteva.com/upload/files/lerovuzejizufimununopev.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8e6861cf08cce47c602b2024719b0dd6/35396964057.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/11781192820.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/10733084186.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ecaf7b268c7d5539f80f793792dab38a/rowexeruwivutidaruv.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/75527764350.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/lapasafovufiwaxogirosaz.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/88422706032.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/siduxoxogibunoxigajubuxu.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/30133407452.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/sobunixif.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/nedezukenofefivijunuse.pdfIn PDF document text
    • http://viorina-deko.com/images/file/dopogipuwafajupipu.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/61808757166.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/zitarozafawex.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336809212dc---rajaluk.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c459578e5163d7a415aea0ea299c64f7/bopak.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/37755307430.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/64870848781.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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 10140 bytes
SHA-256: 09fc838d222dd1fa5a348cb56470454f70ed59c7fff1d4a7ab3dc479b59cf370
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 17704 bytes
SHA-256: 2893bf447408998be204db96f2789d3aa40c3f8eaec0121df680ec76ea25947c
font_02_sfnt_off00013090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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