Malicious PDF — malware analysis report

Static analysis result for SHA-256 4412cba9f5fa33e0…

MALICIOUS

PDF

86.9 KB Created: 2021-07-18 08:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da2a5dde7a4093686f7da01ec8496e29 SHA-1: 221e00ef0ff80a73084c81555e8c0489c8d72228 SHA-256: 4412cba9f5fa33e08894d49736c404b539bb19a4876b67587770bccc8a267869
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. Heuristics indicate these are likely part of a phishing or malware distribution scheme, with ClamAV detecting it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. No scripts were extracted, but the primary attack pattern involves redirecting users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608337fc63640---wavolowo.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5270519d09e0f5455ace6f1f930d6458/tovevutofivogoguf.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2kibo8chvb9bqv8cetva36p7pn/22400702907.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/gegijijokaxodalelubup.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69e63afc6b---43886111.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/68695cfea0fde49d7b469820b7d4d4fc/96060267715.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9492c3561---kagatulosizasolafupan.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2a3a236e---48126802870.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/rimotogivaleba.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/30282404684.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/60924243554.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/sibolaxufidopafufavarure.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7e367f93---gakafapuxebowedagi.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/megoxuguz.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/woserabamurozil.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/11013022467.pdfIn PDF document text
    • http://usmleworkout.com/files/file/wafewel.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06eda8eb0---4937763586.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/a6j2dbdpq75td8lshs3bur0l4v/xoronofolinavugi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51849724708.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/39581755814.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/15312087645.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a054482b205---potokisiragelofipuwoz.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/97736f726c39223120bbd5bf4e557dae/mugakoditibajojawerize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=valerie%27s+home+cooking+chicken+cacciatore+for+the+soulPDF 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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 10980 bytes
SHA-256: ca030bf4047e81535c6e5b9073a4beb9026e5ac0b695d0696c29f91c8c7a0f58
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 17588 bytes
SHA-256: d07a7632c03825e40c75b94ef70a2b0e6568ab58db5abb9f5ceeba8287f59ec1

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