Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc47c9abc4e21623…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 22:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ac20041cd2ea221c599fa0761841d0b8 SHA-1: 55b44cd08bff1b5f28500a080d6b8f169da4c4d4 SHA-256: bc47c9abc4e21623088ce808d86d64d24dcbd4a8bd4b029cf75895ffc552c6a8
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further indicates a lure to trick users into downloading a payload, likely exploiting a client execution vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=subtitles+for+conjuring+2 PDF link annotation
    • http://www.morrisjones.co.uk/EditorImages/file/80265925147.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/29040146903.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/dojusiwapunowevebulemer.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/pipifijagirejil.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/11291643511.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lanuda.pdfIn PDF document text
    • http://etnorom.hu/pictures/sitobe.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/lesokimobujotigajuzev.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/67480817858.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141afe9458ca---3927223496.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/vipexenamukosoxuzov.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/11536132208.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hm0rruqumbhg0qdnqovoef3feu/bifas.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/moloku.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/48381398114.pdfIn PDF document text
    • https://ikima.fr/uploads/file/30850857893.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/69115097262.pdfIn PDF document text
    • http://apsons.eu/files/file/4257425867.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411b4ef16d8---80449219486.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/moxaniwadikikizu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/vuwiputaf.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/gisanasog.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_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 17588 bytes
SHA-256: 105ec903d74fdb4f6307d9a77f809bb56fcdd096af9800d4b0a5700bbf2b7078
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10916 bytes
SHA-256: 8dbce59448be4cb160cac24996be598e94e18f185577e9049f0b27081601a04c
font_02_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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