Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcde05af7da4a59…

MALICIOUS

PDF

79.8 KB Created: 2021-06-25 18:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 976b8b9e5adb89f350123359d0621f4e SHA-1: fd47227eda79fad7b372c7ac8e34a1e963efe2e3 SHA-256: 9dcde05af7da4a59d733f276997ddf276f8fd4e86b2cf8bd08c64b8c68ae1b5b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. The PDF itself does not contain readable text, but the heuristics strongly suggest its purpose is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • 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://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160962fe80dbb8---motelumunijoxemaviponiwu.pdf
    • https://ctapigroup3.com/contents//files/kibaxosixepemu.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521100723123997.pdf
    • http://mwflower.com/upimagesfile///25681025310.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0f7b2eb17aad41c30a8d7613409c327f/79818954024.pdf
    • https://banghenails.com/upload/file/18964961409.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/23835409476.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/vuppu98mf4aoua8n0do7a9bpi5/18162386467.pdf
    • http://suarezbeltran.com/aym_images/files/35643526666.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/sktrlsjudbc5f1ktcg6scn8do0/tirisusakobul.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3c56118529c5ce58c048a3b8ecc23995/54248956529.pdf
    • http://akcjonariusz.com/UserFiles/file/vagoporivolowuziradevutu.pdf
    • http://azseal.net/uploads/userfiles/file/mewatupebepisejisagibepij.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/6537487508.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9321cd60259a30b10ab7b5b4da49661a/66882489203.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e53497ebe---48615090161.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7c6a3db5---64141955625.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a97986d85---40540445330.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/aa0b6ddcc6de2c24965d98eaa5f5f2d7/68429968056.pdf
    • http://campbellelectronics.com/uploads/4773406672.pdf
    • https://thaiwoodengames.com/files/upload/files/22155544199.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=teddy+larkin%27s+seafood+and+steakhouse
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29c.bin
5236067943371c84797a88809b3ae48048759c094e41eae2ce3015ed5445f67b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 10752 bytes
font_01_sfnt_off0000eb5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 16792 bytes
font_02_sfnt_off00010370.bin
e9b373f767f5965c56a2600fd9e2577b4ff80b72d6f35c61d6a653234810c7f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 17336 bytes