Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a9c1f784495dcf…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 17:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe1795cbe46f283ceaf16ba5b9ab0098 SHA-1: 384175294467dee697837091a3ad59409058e925 SHA-256: 54a9c1f784495dcffa5d348d09ed0ecb3c9057b695e7c9f7df74832205f210fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of compromised infrastructure for hosting malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=the+witcher+livro+7+pdf+download PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c92bc639---6638450513.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/dupudutedolijikolug.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/16909780331.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lomumetawinizuzotekuk.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/gujojo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94fd8fd0c---tugimupelugub.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/jubidosibebuw.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/57347279275.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/kegegetegok.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/96074790061.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/25024226328.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/cb57acaee1a6a9ba153d7d308e540659/kiloxiwob.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/77643628284.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/32462696051.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/zuperedosavopilaber.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1aec7d321---85211261384.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/vimewurexagafaluke.pdfIn PDF document text
    • https://southafricapools.com/contents//files/81718600457.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2541f3754---35247128016.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a839a840878---58294024023.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/gujuparadon.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nilitopa.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://gesundezellen.com/neu/userfiles/file/zupegelebawajigife.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f266ea00ff---70672844726.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_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 10712 bytes
SHA-256: 8c71ad724b75c8039319bf3598aff7fa3c9707a44e59b71c83723dd0ae7c90df
font_01_sfnt_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 18288 bytes
SHA-256: 4e577c01318e94c59e2a40daf284bc20bb65ca3ec6a91132d7b1f89c9d48bdd8
font_02_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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