Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd6866928a23b71…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 20:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38ce4e83661c2c184b181a416964a1ea SHA-1: 17112b8b3c979335a2bd0dc023932d1b145015e8 SHA-256: 3fd6866928a23b71c97c62c4e3a5a46cf7116e805d7f8931368d961f07ff3178
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://crysiq.ru/uplcv?utm_term=sao+season+4+dubbed PDF link annotation
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/38119664022.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/2469883016.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/joxisugiva.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/kudujizo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd7de9320---41932009922.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/nanulajifawoluzubagidaxi.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/mukuwavadapudipumub.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/25135958483.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/16813248311.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/jivane.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/32240479603.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/72395479464.pdfIn PDF document text
    • https://digireg.sk/upload/48760499764.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/91165316238.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161352c9d8bdd0---falenibawifi.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/dasazojek.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/ponavukumuzogufovuzeriv.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614080cc36b04---68657983534.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/61552133827.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bc67dfb75---waxamosav.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/datafujatodorewetod.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/9475926817.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/28456131994.pdfIn PDF document text
    • http://underbutter.cz/download/foto/jamurixetipaxunupu.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/23879707542.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_off0000b91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91E 10300 bytes
SHA-256: 5248b7900f0295654a7bcc6c22fcea3068addf4f7e9915dac7c5abde318bf2db
font_01_sfnt_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 18916 bytes
SHA-256: e923eb97c103f9545aa1b73be9df873260c322c095d5ed92e20dcb938da8c2e1
font_02_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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