Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae665790388dd56f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 18:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfb629ed4ee2fb71c461d0c192837c7d SHA-1: 0956ef2798e83b207997bd68ec99501db3a4c396 SHA-256: ae665790388dd56fa3a675544b03626fb80a560fbe0bcf88c3fcecbedda88450
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=ejercicios+ingles+futuro+perfecto+y+continuo+pdf PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107263c028c1---17852539280.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a2e976544---netileribakabuxer.pdfIn PDF document text
    • http://www.celso.org/download/94491148362.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/vaviko.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc7d1485a---34752959938.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/73319858890.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/jegagufufurorigoji.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ffab9b87---18818448244.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/bukufolinigogosika.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ef61d57eadb7a4e20cec359aa6ab2e22/32549685633.pdfIn PDF document text
    • http://dogable.de/userfiles/file/xenumesateniginapamoxojo.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/71406141135.pdfIn PDF document text
    • https://digireg.ru/upload/78713703238.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/43560136225.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/56526042925.pdfIn PDF document text
    • https://blv.by/upload/editor/files/mosapigifogefivoxukaw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a10a446fcfa---24348614370.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/872421703f35391e5570009c1e83b9df/numidi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c69da5155---xesuduwan.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/k4iu0msaf4c88vufhuns9hsjbj/62855555019.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/jelitaxonudibufav.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb028492f---77574739148.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/62038704891.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8f48eb5636357856536d634edc70fba4/basugivudinidowivusufuwi.pdfIn PDF document text
    • http://imaginove.eu/data/Files/witofunonegorepujuxovof.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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 20028 bytes
SHA-256: ec0c0810d6e8fbe05f2e7b0119d2ca1bdd73a613ef43e3d7ebccba43ae356299
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 10960 bytes
SHA-256: b6f3ffe2f6249332a9ccc66cd8e96bce48550ec559217b722a0e11b7d89a3dde

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