Malicious PDF — malware analysis report

Static analysis result for SHA-256 4022eace7e49d689…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 09:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fcd99505336839a1aecef5e4aa56298 SHA-1: fced1185b6f4c558f2d34d362ee5c2d0ab5f31e2 SHA-256: 4022eace7e49d689e289742b2a55b82b336f9a2cb6b4c18e73097ed977eedd79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, while not directly executable in this context, suggests a potential for further malicious actions if the PDF were to be rendered in an environment that supports it.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=adobe+pdf+file+converter+software+free+download PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c923d0230f7---jenedelovofemovudade.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612719ec2651f---buwoxepuxuwedes.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64bb596130---navavobokiso.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/latifijewofuliru.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c69e1222374b009222284cd6397c3b73/45149405289.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/tusuzoxataveg.pdfIn PDF document text
    • https://yuss.it/file/37356641277.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/63596007881.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c9752df2478---dukoxotekelojudo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbf767b215---pekupapukono.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210821160943.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sibawagimolorufuwujaz.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b172a0a9b1---wijaw.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ranoxeratudepujabuxa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0df37214c---fumarabul.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/15517416746.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56cab988e9---bedetufisa.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab397a29fc---38286632971.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/77834996869.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e5154a51d---43299129086.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/70761594373.pdfIn PDF document text
    • https://airshow-bg.com/file/67835020918.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/27579233240.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16302561381561447647.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jusoto.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_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 10884 bytes
SHA-256: ab33e303d9b376ed83361a9057442e5dbbec89421c070e48e8ca3a4d44527efb
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 18168 bytes
SHA-256: fe6ba4a52411aee9f8abad629abd40d425ad023cfae9ead3b04a33e3f4854dd8

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