Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a20b5572ef7c0f2…

MALICIOUS

PDF

88.3 KB Created: 2021-07-10 02:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0555d8f77eb26259724adf0134f35541 SHA-1: 662b59cc738893fa30381f6e8a0b48ecf901df2d SHA-256: 4a20b5572ef7c0f2bd40d8eb51c2d73e357f41629c636e20a2120b7a6507e245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://laborke.ru/uplcv?utm_term=the+clinic+for+special+children PDF link annotation
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf41841bb8---zerodonizasis.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/79877980912.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/64258079615.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/72256275091.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9496a66aa68b3b20b54bfec353278291/sukopapalekalatediro.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d175576f---27829207468.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a38baa75a4f39f7dd2ef222817c8bc82/dokudejubopezarasik.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/mokefotimije.pdfIn PDF document text
    • http://ttc-investco.com/img/files/gikudoguwojadetajuvolenul.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160736effc04eb---14890451165.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/21885670051.pdfIn PDF document text
    • http://asustainable.com/global/file/39985315360.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5a8e89edbaa48ac7101b7fa013b91073/zajuwubelarur.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/797c0dc98be3c46bea09cc98e88a22f4/wunedifavilivevid.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/22928234589.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/54241467408.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/l8fqof0j856l422mvlag5k6q3i/fakotonoperawijerija.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/novitasagakiwa.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/9638611860.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9755f2ebcb---83649957679.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a890a9a70e9ee0bcb6f2f6ec4ead5563/91222629922.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/33221313055.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_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 17540 bytes
SHA-256: 7b2c157df26f97d7a8eca5a496732812d43ef2d32a0d45f456bc79eb3cfa7543
font_01_sfnt_off000123e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E9 10584 bytes
SHA-256: 8eb544cd1259e92e63f4018f9118933794b5861e8579505a06b931349092fe76
font_02_sfnt_off00013bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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