Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddef3b3ce9ebc90…

MALICIOUS

PDF

150.0 KB Created: 2021-06-25 13:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1c286b8bcfffbf180a7e5a1dbf7dd667 SHA-1: d8db9eb2ed460ea521a29b524568c083b9e942b7 SHA-256: 3ddef3b3ce9ebc9023daeaf66499c0e1036bd9396795a4da1aa3f9382e2a2057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://eastcoastbiker.de/sites/default/files/file/25552104647.pdf In PDF document text
    • https://wittnebel.dk/file/bivipalakegazebo.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/41e9cb930211e2f0d4a58ca1ce67fbcb/92325703834.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4db2f323---93608488820.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6a3ef76a---92381139138.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/gepetijaxarovimadukedoje.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160896b272f36b---76631332294.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/2llmb40oif71h8qqqjqhts4c7h/80184504653.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/701505bd4eaacecb9be2fbe42319cda5/wowamawinugujakoxonut.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7okcu54imhfqmrsqvmo85r2umi/86709573106.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/25318617271.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607704e487c8c---83056012174.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb98c746c76---pawokefoxupewesinadunoj.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/24467158603.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/40252920982.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/37c6dbbaa15d48f611ded16bdfbac486/zanikatijiluxevodum.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5575edf43---25219272058.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3491e281ffe743d8f176081ebe377f96/purajavuzu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3f2c90c6cee3e0341e487d0d8aa8b063/26028422362.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/88533579183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=skydoesminecraft+post+malonePDF 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_off0001e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7A9 11060 bytes
SHA-256: 4723b39d147c9e8296d31fabd21f7dcbe216781559e94fcf7efff1cefe71447a
font_01_sfnt_off00020162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20162 18588 bytes
SHA-256: a806032274be2000ac5f7fb27e86d63b391ba0b6112d26eefe6f483a59abdf65
font_02_sfnt_off00023287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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