Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a65d1636322e0f…

MALICIOUS

PDF

82.1 KB Created: 2021-07-17 15:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e6399273eeb5fa02e06deafc6eaadc6a SHA-1: 4a3a678e7407d83c814d2f7656b338d819bbefbd SHA-256: b6a65d1636322e0fb24b321d0586049ff1b27e28a237ae6973a00b9e118c8cbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a66249f395---jojax.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609162080185b---bavogemurizuzimazusug.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/20050849146.pdfIn PDF document text
    • https://fallsplat.se/file/99974042262.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/91969856072.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25f0ea21b---71172775022.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pfn91b8ct50bp4pivde8t60p11/55425910810.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091706d30deb---39405374445.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7f11ef81---kogubunewamaxebozavemu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8fd17871060fd67c3f52e8c1cc2fbf0f/29547576946.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/vitoxesur.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/u1d7dq3nve6n3ruaf7u0s11k73/29996346645.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/28836407007.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/meseluvevukuwafitob.pdfIn PDF document text
    • http://garderoba.sk/images/_file/52723075986.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/a89768c950b93b67121b49cba7aba637/45315671351.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b4a72cf54e39c01ac7fef0c829d3384b/4354465730.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/45456c17b1fbc2e15e3ec5b2941d2d23/64851775243.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/jubalubufobu.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/22291743686.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/galevasixi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa59d802b8---38636442428.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/zebufojofo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2a36a5b9---bilapijetokimudiri.pdfIn PDF document text
    • http://gewald.ru/content/Files/fudovolisakagediwesun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pdf+to+excel+converter+online+freePDF 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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 10308 bytes
SHA-256: 22b01b83c4a54ba8a6c4d4cab46d62614c400223a983ae46b43082c45b036034
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 17000 bytes
SHA-256: 2bef72511e31746b1f73fc08107d0af4160f11a1f73290563e594bbb9c15fcc9
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1