Malicious PDF — malware analysis report

Static analysis result for SHA-256 243f5dddb88ed003…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 01:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71556323e7ed7c524b1a07ea0514bd6a SHA-1: 84d2c849ccc5ccd6a4d1e1ff2632373931e1b95e SHA-256: 243f5dddb88ed003559f81cb033f96c288e6c06d73d311533b7fa8ce19eaaeeb
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to potentially compromised WordPress sites, suggesting it's designed to lure users to malicious content or download further payloads. The 'SE_CLICKFIX' heuristic indicates the document explicitly instructs the user to run a command, likely to bypass security measures and execute malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://mevlanaasm.com/resimler/files/bajefukitajedotasefet.pdf In PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/badoxeropogi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/42b1b9e815cfeb80bbae03aaa47d997e/94776032846.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pufamogifafu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085c268dd5db---koloxepuloni.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c889487f0b9---sotazejofasejolufomigi.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/zadibenutetugif.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ls77h05mvpqohcocut7nn55knq/60170326247.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/lofimitozarojogujabuve.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/96184854954.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/mowemumefele.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160eda6a53fc04---wumuw.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a7e6b4578---rewapomo.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/tipanireb.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1a665137---91580733739.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/89220747550.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/noxupezinilunabowetu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b7b8238c999a54a2f68d0f1d0bb9cfd6/filujimufasodu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b4f62f14---rovosimazojavip.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4169438bda83285ec30b15d0d2d03f55/2518495831.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/47808078406.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/mominuwasafopijeboso.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/fajunulatuzo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bf019d55---rudofuvobe.pdfIn PDF document text
    • http://teifsepahan.com/files/file/mikoku.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/47110697644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=audible+manager+for+windows+8PDF 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_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 17260 bytes
SHA-256: 2b5d508bbe5d5715793f26533ee2ad28eedd60f4f603e947cab79465c68d2f4d
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 11112 bytes
SHA-256: 9e818d96e1cad2eb2f8d6e6a45517bb46371bdd185ca733153c2a631057d426b

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