Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdb2d857ae121f9…

MALICIOUS

PDF

114.6 KB Created: 2021-09-01 20:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 398bbdd9ae080c63181c0008460de984 SHA-1: 8c9c2edaaacd8994f005fd820cc372a2231f911a SHA-256: 6bdb2d857ae121f9028f81a861b9a0c7cb39875b791cb88d82a962e9ca562d0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and numerous links are indicative of a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pistant.ru/uplcv?utm_term=120+degree+lessons PDF link annotation
    • https://nhadatonline24h.com/Images_upload/files/74051612520.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f5273a52161---48084299048.pdfIn PDF document text
    • http://stroi-sistema.ru/img/89027962210.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4be4e91d---bevikeko.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/36b08a9f92d776c09f331dd02939182d/4333914514.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5525ab6cb---43276093473.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16233216366.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5fe30313e14012e341c9f69c860238fe/67622937251.pdfIn PDF document text
    • http://valeneighbors.com/userimages/19551055053.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117db840a733---lumizok.pdfIn PDF document text
    • http://computerdoki.hu/user/file/49801908518.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1127860963f41df5ae7a7cfe4e8c9194/63968923244.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/1801567280.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/zivusejaroxaxepaneke.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2113e003d---tiwokudofuborafotefakaj.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/30416113119.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/xaputunofixumatewuxameno.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/aoo13de8jm246jba3tk2t7h4n6/43013688056.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/ronizexaz.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/rofupopede.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/26280748079.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/24188866656.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/bokadawudidakido.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/vabol.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/78017965317.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_off00015a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A61 10268 bytes
SHA-256: d2c86151d5abd3e92aa87c4e61b486fd73b1bec764f21263b233683d2493bdfa
font_01_sfnt_off00017166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18978 19348 bytes
SHA-256: 9e08de0040143de613e9f4b7f918fd54584217fa1f9944d8703bc35817c224a8

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