Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0064b720dae216…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 15:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a5a24bd0325e4efd5b17073836d74e6 SHA-1: 5f6894551618fc676c744b1b7ed1523e81f3aef8 SHA-256: 4e0064b720dae21691f3910f405cc9214e6ab83d2bf37209c561b08dbd236759
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to host malicious files, with one URL pointing to a compromised WordPress upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903152138725163.pdf In PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/molaketukomejuzo.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/73070985368.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/pesowawuwinewirokolu.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/3995294111.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/17922022820.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/2549404443.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/dd4b35d25ffcc6d22b68e7c426df74a5/muvopazogunobuv.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/93666310226.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/23863552319.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/70977232827.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/17981945749.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/datosawibirepipufadiwezer.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/rowakow.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/fetel.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135816318d22---29571928060.pdfIn PDF document text
    • http://usateatop.com/_upload/files/64200083479.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168bb5287a---pirodexejutesen.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/88055877090.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/najaxofulenamurasawekaba.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/86964488226.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bidaduperirufefu.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zexafut.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34690026941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jhalle+full+movie+downloadPDF 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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 10496 bytes
SHA-256: c3759e41428df5b4141c9af3fc93728bbf3a44a917e1c48f68e3b4afa23027c2
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 17748 bytes
SHA-256: 8a01f7bed0fcbe9852bb32eea4b3840e0342c8b4cfaa7b74e01dc897de075c44
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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