Malicious PDF — malware analysis report

Static analysis result for SHA-256 684e79b72a36f0ea…

MALICIOUS

PDF

99.8 KB Created: 2021-09-06 16:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6aac4d403b8c12b35f32e5b8b78f2a1b SHA-1: b797298de0f8323fe802e82a31fd5b6c721d606a SHA-256: 684e79b72a36f0ea2b02830fe9a7568f3ed62b19c67c906dbf7febb9e8d10ee1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=ways+of+the+world+textbook+pdf+chapter+3 PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a23ee9515380fda9f19badf5e71b6112/vuwabevajalajon.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/lidibagapezonoruwovibami.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/lokesozixabipaperevur.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/a560d9l71nphsuovot8ddldh3g/25589078201.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/toxetarage.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/95d18d9c54033bbbea10a7c634f1d203/72264356187.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/nubiwofawagojuruzem.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/depixedag.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85da59490---govibidipipolo.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/96867033514.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/33349324356.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099dc3f26bbe---27053616855.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/97424387608.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/r9gtb21a2c98cu69h2suoqq34q/wituvopaleb.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0dcb492f6b256f7298c6d01f6fd922d3/92373310525.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/686f7ngses5ipegsarpv4slk5c/vunawilevimirotilivug.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd75e8b4a81---bujaxan.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/51985175747.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161294bfd02147---telunuxetino.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/28283125771.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c030c1195346d230819aa583324dc172/jarukasafixidupoxuxoluze.pdfIn PDF document text
    • http://asfalon.com/__files/file/63290189175.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/93227791534.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6btc7n0l4igjandp688a1h1r75/67403987369.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_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 20628 bytes
SHA-256: e9da5d6685de9c17271680a6ba89380eba125990cbea308da2c9fa9a673663c2
font_01_sfnt_off00014ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC1 11220 bytes
SHA-256: 7a709a327fd57fbaaf99cb2d6f6e14601551dcaf3a3c51e0697b6b94d060cd7f
font_02_sfnt_off00016924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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