Malicious PDF — malware analysis report

Static analysis result for SHA-256 8303a68c45e2bb22…

MALICIOUS

PDF

89.3 KB Created: 2021-08-09 20:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ea57b19b98f4cc911c22a4bdb64fc86 SHA-1: e509bfe67dfcf7ad0eb5dfe551b6b89fb42ba358 SHA-256: 8303a68c45e2bb22b441fda52d39f788608ea41d18053e82f565ece095a07672
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. No scripts were extracted, but the primary attack vector appears to be directing users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=origen+historico+del+apellido+marcos PDF link annotation
    • http://atut-biuro.com/uploaded/file/pogamosatetisewulibinozi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/levima.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3458204d---32619863006.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/xurafoze.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/2262936722.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/zavusuwemubiraze.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc8d2b1fb0---71470689035.pdfIn PDF document text
    • https://isosklo.cz./uploads/57084711077.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zosefevadudumoxunat.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4888dcf6---84687140375.pdfIn PDF document text
    • http://temple.mo/userfiles/file/10152711122.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/66189411067.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/soxabetiwud.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34bd333fbe---13969417546.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4b22f84132260eabed65a287b56121df/luvup.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/88649933394.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/38632420788.pdfIn PDF document text
    • http://renovator.cz/files/file/zejetugiruletoto.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae16de456f2---67540018080.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/74936080893.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/92e6739586e2b4ae2bf6cd72a57c2be6/gefapakib.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007d9778b61---35733655035.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/xaruxupivibobikebix.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/xunufipaz.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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 10988 bytes
SHA-256: 1c89be41b7eeba4ff001ed7a91eee55d918610a9825a295f76eb354a11c0d6be
font_02_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 20704 bytes
SHA-256: ac03d6d3ab4d896e9bee9dd28ffc4ce9630f5bfb853e514b92e1a5d7d9fe20bf

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