Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4a53cdd4ddbf72…

MALICIOUS

PDF

88.9 KB Created: 2021-08-11 15:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2f7ae1ad95382cfb6a5749015afbef3 SHA-1: b2a4a71d2cfe3e0beea900302233f9ddcc97572f SHA-256: 0f4a53cdd4ddbf7200589c77df7ec26daff8237ea249bd615096605b3126fd46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised CMS platforms or disposable domains. This indicates the document is likely part of a phishing or spam campaign designed to redirect users to malicious websites. The embedded JavaScript may be used to further obfuscate the malicious intent or to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://chcial.ru/uplcv?utm_term=how+can+i+turn+my+personal+hotspot+on PDF link annotation
    • http://penzionklara.cz/userfiles/file/rizapu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2e05594f7268b6b12e02990c53743f9c/rovudiz.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/h2cesfhshv5n4osvlhvtjqbb54/16470009030.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b5987bdad4d0e8677e59d83af1975bcb/gizif.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/jalisax.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/mudedugapuf.pdfIn PDF document text
    • http://normel.org/files/upload/file/tapoduremapemepet.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/u6fhlt9irk5ru89gq5290ho767/86922498873.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0fe68e37c011bc69a86f53fd9af404e8/91759432358.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/wobawiwugufuluvofuxura.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d260f83942---garive.pdfIn PDF document text
    • https://nexusmediation.nl/files/53976633890.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/foa1dpa2tbd6465qb8bk6ntjvj/28805235476.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c769e6961---gudedimemip.pdfIn PDF document text
    • http://www.agot.pl/upload/file/kegurisudovegodofoguwofa.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/85169321602.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/48355003048.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/gafewimi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/j80g89291pmo2iro4n2p2v8v23/totife.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4c17544c---fawokukuvefigobaxuma.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0fe1e6f28---77656754407.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/eu8nv8lf08pg9i740mp0apvmq1/91869238928.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/20889388993.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/1495461205.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_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 10928 bytes
SHA-256: fd68abe27f704ca1c676417aa0c137a1f70a6411d1ed2cba742f13483ce9ef47
font_01_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 17240 bytes
SHA-256: dded3a7482159db73b93f8674e8d3649c8beffa8dcc642755610b3a036101b82

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