Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55592c06ac33091…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 15:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c60cca8db38a5c2bc9a8ce98bb80dc1 SHA-1: 21f953ed8452b991dd47244ddbd572d7bea5b5fc SHA-256: c55592c06ac33091c206e09222a1efd441af6973bef7ce6b018c7fb322d1a01f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites, and one specifically uses a 'recovery disk assistant' lure. The PDF structure and embedded links suggest it is designed to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=recovery+disk+assistant+catalina PDF link annotation
    • http://edelstar-mos.ru/files/rapuxilalonomasivavetufo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610825ed6e968---mipejezabu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a66274502b627999b182b1ee329bb992/mumiwapijafijorodomexe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3c2df3b0---84302834057.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/snq1a084kvuufma1vcgkg0nbn4/nijava.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1jsvk49g51rgnkdj9sjnijogh4/jelebonotefesiwatonupu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/mufawof.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/98729968926.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/dufanip.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96ed6dc92---95062183038.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/83914208540.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/saxifadavofugugifubolu.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/fitatidiw.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/81690597297.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/43079397277.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/jifuxilugojumumewu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/tulabagotaxe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/80598283796.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/fiziwimakujadaxifozugik.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160719fde21cda---55084960488.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/99753505e86e02ee3a8c212cc779324a/remasixatede.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mohha0kvkj62ksm47vjfrkjhf1/betejovanirixofifofiw.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac778eccc---15751196365.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/namuname.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/21246246099.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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 18488 bytes
SHA-256: 3f4b1844f3654ec73aed61b624d5313cf858bc2b833a06e07824cf932d367e5f
font_01_sfnt_off0001151a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 10680 bytes
SHA-256: d75329e322d7720231888390b9405108435d44f478a24ff6381f8b8944455947

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