Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0f3177c49fae7f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 09:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d8977b9f9a02fde7cb6a5042ba088f3 SHA-1: f9af9f4fd9f05a44c9eed02832cd7d379731e131 SHA-256: 4d0f3177c49fae7fad3ec69e90801c6172df7bc6f609c8319d31f99d4b3e5945
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The high-risk heuristic 'PDF_RANDOM_URL_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to deliver further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=partition+piano+gratuite+pdf+queen+bohemian+rhapsody PDF link annotation
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/8bvvhh19alpv79buolmo50bik3/gemoxizifewejusipejaj.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/72511f8b2c2492510a51b283154f2ac4/latixiridasirepemewu.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/kojevudegolawilufokilov.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/87051249949.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/gn2t1bvmqrjfonniu5ps5eedo8/biloxapibejizopuketar.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/kaviwegazan.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c63ad0f81c---kabunifuvoseg.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tarurakozafeni.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8e695f87aa8c0f5d5afbb5eeeb8558b4/nibugapu.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/regukota.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af62b0ee1---34751716740.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/69300068193.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/nasazegilix.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/redagomabala.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/tamepubokeb.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a146377ae274fdd47905925d2c73ff56/nojilelamajosep.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/36090480891.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5414fd5206---dijarivuzu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c54ec0eb86---jojewiwobedu.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/kojitososo.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/vimunowojatuketoj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161031a7e9ec18---56870900859.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/29785394281.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41d3d0190---vefipaje.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_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 17456 bytes
SHA-256: f2c4e07493421cfac21357704a28e4b233d42bc4b0f1117abf1e66754e41b51b
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 11400 bytes
SHA-256: e7484a15dde01c826b3cdbd0e35f3e192a609100f63bf9fd6164df83afcbf146

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