Malicious PDF — malware analysis report

Static analysis result for SHA-256 8106395f0b47a50b…

MALICIOUS

PDF

89.0 KB Created: 2021-08-02 11:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9e5948d2a79dcf0a0dfdfc32d7c2f77 SHA-1: c53e4c95aecb5d6fb38d146f439d3f4b3cf5fb7f SHA-256: 8106395f0b47a50b08dcb124e28497787ffef0da05fe5db3071fcdc0b81df432
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These findings, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', indicate the document is designed to trick users into downloading a secondary malicious payload. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.jobsincrete.gr/images/_user_na/file/xowaziti.pdf In PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ii695qgjb4usfpfdtqkgfslg3a/sakapolelunopija.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/favikobukenud.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a7be0c61---54029664291.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/30783103909.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba15ecba64---danapibamurixamoreb.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/majomogakizupa.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/s7s96tjqd5hcd3j3bicjehj7pm/82436624878.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/49774605298.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/682bf2c4588e45126f1c65df8f11c9fe/65166554194.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/wupawive.pdfIn PDF document text
    • https://toocapen.com/files/dagezojuwitorirefepukeg.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6a276863dfef38f4fbd952dfb76dd193/nanuxekikikugasibu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rnk8a019kr37qu641kjut1s6li/88972560678.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ng1frorsoacjk0dpavo83e1n42/mosezutuzuxilujokapisade.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/mukapafusejiwilivutuzoxe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092425a396f2---69014128027.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/80846362876.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/bepapivalonazitaxopu.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/musagomiditikamag.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e63badaf---bavesigimatojex.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701dacbd39e---tibodov.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/2a8e11b13135ff7f5132e12c7d65279f/89467585430.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/tusigedupapi.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/vizorulugaxidarupofo.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/96430e0fcb8d0acf5eb68a63c41c5498/16597469330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dino+crisis+2+pc+downloadPDF 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_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 17504 bytes
SHA-256: 6c8cd3f9ac7aa9efe5ec75d9641ab4869b3825f458375dc114b2f49e8b5c9e1a
font_01_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D55 10484 bytes
SHA-256: 0036bc11f61ce8fb4f65663c98b28b1e44455dbb1ef5cc352bca7d25e9a7d394

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