Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfef4b4dad1894f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 17:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf7ef8a389d5360db05a3fc7b97c0f6b SHA-1: 7684a7b6d70d4ef7c54c79355e5c406adfb2667c SHA-256: 9bfef4b4dad1894f059fa34fdc069ca0913c4d98d8d4c5e9993357fef740716d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or spam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=2006+lexus+is+250+manual+specs PDF link annotation
    • https://etonbio.com/newsLetters/images/file/42696113176.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/vixotokedoxesolakemupiw.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/judesifiwa.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/30452771935.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/tamizifov.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078287ca86f1---goxuna.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/fepujinigoxamuni.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/xezokononol.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/96317124464.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/36915784047.pdfIn PDF document text
    • https://longhoang.vn/upload/files/61604785719.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v7br0b27huink8oe6lfqggqas1/pegobuletovibenisasenab.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077890dc77f3---62835581643.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a48c8697ad6---jadukezarufodore.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a8a5f431ec23f199e8aa5d9b3d7e4de8/noderesegewelogol.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/efc30355da4c527756b74213720acfec/jelenawalumob.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/55017152767.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/nimeduwotunu.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/66392997509.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ba6193d7---vexozatesa.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608719252754f---62652193219.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/17514467898.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_off0000b2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 10864 bytes
SHA-256: 56c4a68566b58ca6a5b6a0882a11f45527878e6540e72997705ea36cc43be542
font_02_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 17404 bytes
SHA-256: d7cabc2e0b1f35f44f64cbb552be3a7e8a8e22913aef328b95792214062e293e

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