Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba4c1ad073a3e1a…

MALICIOUS

PDF

93.8 KB Created: 2021-08-12 00:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9e01ffbc3bf1ddb813844a909af82fe SHA-1: d5dc8d20aa0193be18ba24831bf8d43ba491d445 SHA-256: 6ba4c1ad073a3e1a1a6731d31d463e8e2b4bafbafbf0a7e0a754fbbd9b618251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised websites, many of which host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The presence of multiple external URIs and compromised CMS upload links suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/49fc71cbe1531417588cb85a18f93f44/soxokodeketazugitijameve.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/bujefobiba.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/begesi.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/3694654937.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/638d22bee494f704ad40c278b2a9282d/fevetavaguselasejirodite.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cabfcef7e.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/gibezimumoteri.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/94729877591.pdfIn PDF document text
    • https://incense888.com/uploads//files/202108010522303056.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/81627747940.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b5fb2e63---74827007440.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/31687323757.pdfIn PDF document text
    • https://eniedu.com/data/file/20210807011347.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dc58eeb182a---matozug.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/tefediwaxezutaviki.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/rafiz.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jb3qt3hc4la92aadcqevaushn5/zifetibeveradibazibesasob.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5d4067376d939d16dff3d56776e9389/74127274307.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2c6755609413dd3f0f60a1d84666de5f/mapumosejerobuxovakubif.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/8ad539171552879ab86ca653297ba8c7/26839197434.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//61121660992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=discurso+de+15+a%C3%B1os+del+padre+cortoPDF 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_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 10896 bytes
SHA-256: ba33c5218e6614493da6fe990dd9ce322eb36352475eff4e2cfe2e6bb80b87b8
font_02_sfnt_off00013720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13720 18692 bytes
SHA-256: e8e95fdf63968422f01ceef86516fc6c0f66d03ec22411a6843626641c0ce9a3

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