Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1f034291bf8830…

MALICIOUS

PDF

90.3 KB Created: 2021-07-28 14:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b2d83603b011117c630240e8423e1b8 SHA-1: 0d2f566ccc5c154104ff61ff4a958761038008c3 SHA-256: bb1f034291bf8830f04528b9dc5fbc2f46ded8c88f878bf1f8eaa71139de9b8e
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious or phishing sites. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a43441d488d2e675771333fe4e419d06/88743326377.pdf In PDF document text
    • http://tamker.hu/userfiles/file/6487308821.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/kokabibomu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fef07402---25675717230.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e2e0a50f069bc0d2bf0be65a69c1c77b/51056239545.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qu6otaonlin0di304fbi3f04f7/47645945986.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c42db56efd9ebfa10844c64c732b135c/nepozija.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lijotikafuvifovuxabo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f270fd8b3d---gofudexujopotakorol.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jipukafulukuxorafoj.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc34d4cedb---xegoxe.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/diviferonobonisig.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/8423731609.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687777b4f7.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/24734258506.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1272bb81---fudanotuk.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/janofidosa.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7a8c9aed9cdcdfa4d9507deb928ac40c/vatebenobovavufemeb.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/gezanenewuvek.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j4hlrhv7k5lmsm229f99bgmj7k/81676122946.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/kac6di2uv6ab1nih36v4pv07g1/63264153998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=letra+de+cancion+vamos+a+cazar+un+leonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 18788 bytes
SHA-256: 8508faef73c6f7595616dd0075cd1cb499062bcdb5da0986e80d66335c6e24c1
font_01_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13876 2340 bytes
SHA-256: afcc67f1cb938972619c8ce3bad92e584e55ddc2f012a859b34d19d7b10e8dc3
font_03_sfnt_off00014296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14296 10716 bytes
SHA-256: 0a37c7ae47ef74ea432913ea891466105f2d4b4dd34d06739027076a4f346014

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