Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf6d4606bb68aba…

MALICIOUS

PDF

91.3 KB Created: 2021-08-08 13:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9ca8d38c3f27be7649c6c3ca76be8cd9 SHA-1: 102be96e563e658c6047807d70cdde5049aa5510 SHA-256: 8bf6d4606bb68aba760d038735803be02dd293f397502da4b7d7f508663ca515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to potentially compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://repare-ton-smartphone.com/userfiles/file/42684588440.pdf In PDF document text
    • http://hurtglass.pl/upload/file/90877937759.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/20666297071.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/21611280171.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/61510297919.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/90682312140.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/vizalapimobinivi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8c825f910b39ee605b41a36733e94b49/5910017044.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9beed4f89---21335448300.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pk7t8gkc6j5ud2duis5asjab17/39105626466.pdfIn PDF document text
    • http://abwva.com/uploads/files/laponimokitupogafokizo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d614e90f6---33238948188.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/13fe34572a09ea8c37bd221a9293f8de/58498191550.pdfIn PDF document text
    • http://ned.ru/uploads/files/26452096765.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/mefewulixuwipexanitusige.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/kisore.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077979b11fa7---59428993062.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/34551712683.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/728acqj03kf6342qblokpdvru6/92482980062.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/16753039627.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/19681991222.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2vfm73ku04s4io1hl4ip9agfv4/89610219401.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/57474371766.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/70824051079.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/zukobixifemijukesumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=serie+de+rebelde+1+temporada+completa+onlinePDF 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_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 19092 bytes
SHA-256: c642a1085ee495a80d5047938ce7b42c4a33e0231c1655a1f0d72a4de785495d
font_01_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 10772 bytes
SHA-256: aba733d91aaed85ba624f617b92e01b1bce85a28751fa6422e9968b276418946
font_02_sfnt_off000144a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1