Malicious PDF — malware analysis report

Static analysis result for SHA-256 7355d04dae5085ea…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 16:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 335ec716f288055fffd3445f9c1cd204 SHA-1: deb1c510a8f36b8ebd71e1fc519ea6d7800543f5 SHA-256: 7355d04dae5085eae07d9593c31b1b30ea96e419dfec3385fd0ed102a6523e7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the structure and URL patterns point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://giltmorestukko.hu/ckfinder/userfiles/files/xufurosulumakizofe.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/96968448747.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bf4a461b66943736ecbc9195f7ef2b3a/pawawa.pdfIn PDF document text
    • https://airshow-bg.com/file/ganojupaxekogonerofareri.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/rorujoketofivabakerose.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ddaca9df0b0d49c5061b80e5be6c1bd0/bodudusivisa.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/50129945596.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075bee805c92---72625137420.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wofajavawomumef.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/kalebetuposuwa.pdfIn PDF document text
    • http://firegallery.ru/img/upload/wedezeruxobigamo.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/41607833407.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a746dc9050d---matomirepukufil.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160badd9c1e0b0---6828025572.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc9e5eb7a---23433176763.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/feb05c661cb188c0d8df3985c6308163/18366723654.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20215308531877.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/kobexoxileraleruforebabu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/65c402001dbe8825d6336d4f6abe73b6/kusiwexafi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d47131434---kifakisi.pdfIn PDF document text
    • http://coumert.com/images/file/36768520338.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/e4t0bud9qq89tltii0c6a1e63l/16058079707.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/tozekomolonatunab.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/sonuxixevuvusavusu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2f14586d65ebd7b5503876ff6a865e5/71073262177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=adsorption+physical+chemistry+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_off0000bbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 10980 bytes
SHA-256: 45998de1b57d251ad4d7ec092f17e1e9f8a7dcfea5b9c80edf6e85f743f8e904
font_02_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16604 bytes
SHA-256: 2a1240051ffe7cf1aa795684bde6a380acde677ae6462cd0837079027dc6e045