Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbca0d98b190d39…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 10:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21bd6168034fd1dac20d780aeab1f464 SHA-1: bd9ae7bc475f949c0a11fd52b6651f19a993ce32 SHA-256: 9cbca0d98b190d391e3558005a66547c807fea28676f5f85448e0b6667e9b95d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5b6eed19f4db3b9fe009af0a02730d96/63811284297.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b4057b07e23---zutabalu.pdf
    • http://omgmediatank.com/userfiles/files/zugivo.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/23365947732.pdf
    • https://iwnta.com/userfiles/file/85265257236.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kpvc8nsk2cmfv73k6ijadc646b/57712377918.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0510777220---darebo.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/85855201218.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3fdf7ef8c00bb3c3438ffd220c86b1de/ropotejoxifogaxuguvixonax.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c1156297263---83518965772.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac4a54b31---judaxi.pdf
    • http://fedoro.ru/upload/file/garozanak.pdf
    • http://centralgiving.com/media/userfiles/file/gefasadumofedinezopitaga.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f1ae2c86f---24494814416.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/595c054f0019f8de310e70722bbb890c/65776069462.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/793966909947199dfea47f90ca2425aa/ropulazona.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c207d716b18---50091755400.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c212e4779f---zudorujuserosunomuzufe.pdf
    • http://naturallabs.de/userfiles/file/dijukaweka.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160724a8d41946---67043935700.pdf
    • http://ilovechardonnayhills.com/userimages/74434617774.pdf
    • http://taiwan-casters.com/userfiles/file/tivugarepafovosugiv.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/mewazudowud.pdf
    • http://qvault.ioGuard
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+clean+mouth+guard+daily
    • 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_off0000f05a.bin
d5a960c60f67cd8374d651c376f7b8af1c2805557e7ef8db055fdb0e8b711a85
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 10940 bytes
font_01_sfnt_off00010948.bin
ff7850d55a62f222508c47b13c72e4da76b4f6cc6199283b793245fb201133b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 18408 bytes
font_02_sfnt_off00013a51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 16792 bytes