Malicious PDF — malware analysis report

Static analysis result for SHA-256 b786c17da9607236…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 01:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be57c93fc53b2b9ab32714f42f73e0a9 SHA-1: d2871ada92c0f8ee1b4a1ecd3ddf7c23a30a6522 SHA-256: b786c17da960723659e8123c548e21e489c7c4a15502f4f31d36ea3db98bafa1
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering tactic by presenting a lure to install a browser extension or update, a common method for credential theft or malware installation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous links, many pointing to compromised CMS upload storage, suggesting a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/j08p6spiuag09u1rsnmjofcaih/63417903361.pdf In PDF document text
    • https://bachson.net/upload/file/juvamoguxewo.pdfIn PDF document text
    • https://bdcomunicazione.it/file/jewesa.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/digini.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883d252c80e---rewafategeb.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c085cac3cb---bufasotidaboriverog.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/3149446810.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d682c848a---97759091204.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b61073520df---12063969631.pdfIn PDF document text
    • https://ferropula.hr/files/37776084486.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/wirujevesapodix.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/22846515908.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/1276075025.pdfIn PDF document text
    • https://teddybestore.it/file/35940784279.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/13257244393.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gjo1bv1i5b0ql0c4uutaqcmhql/roliduwagebisozubaxodin.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/wemot.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/sejodo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/7700068f1a83c6dcca221bdd19fe6147/jemedefugipigebem.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7quoeq7p8mt5mlvej0rlbdkee4/koxogebitajesube.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/rerazamokaparatevorizab.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8fe67d7e5---85752320413.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/zijeteziwomuxomemufira.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/43014744812.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/62518932772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gamsat+practice+test+pdfPDF 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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 10552 bytes
SHA-256: 7660136d7af82e0c8638ddc8a95fa1f11c8e1e3e8dab41240b786e449abf7026
font_02_sfnt_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 18204 bytes
SHA-256: ea43e11a9fbae4a964e5f1687429a9ae3240355bdb34772b7c5147e0721e7157

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