Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c8b08527a4e0cd…

MALICIOUS

PDF

85.5 KB Created: 2021-07-18 12:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61ba1265a6be295a3de4f5c907655140 SHA-1: 0b515cf834047e131363979c029fbc8c07a33b04 SHA-256: d8c8b08527a4e0cde0e46df1b1b231ac011d09d3c56e3017e19e292c18e07690
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations and disposable domains, indicating a link farm strategy. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for SEO manipulation or phishing campaigns. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/amk8gllb38sn0e2ovk1rb86i96/88058121401.pdf In PDF document text
    • http://www.victoriousintl.com/new/resource/files/40338080078.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/27481063772.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9905735866---tomafafaj.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/25128cb3cfc7e7d8e0555173d081807e/bokelojetogoxu.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/23147318.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/56423461708.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/17782307656.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098be5dd4403---xazefokegubesa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160711faad43e7---zobuwumomin.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/432c337185457365e7816bd7aec6fa67/loferuvikajadevutazej.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/sawefepupakafuvifakome.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/44775730896.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/eb6ed88496b96eeb4eb79b46996babb8/4608852680.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7743c4336d---kisuvot.pdfIn PDF document text
    • https://semut73.com/contents//files/71423441219.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e7f8a880372fc998c561f3e4e57fe01/mitarigibituzud.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/am0pon5jm1j62e8oggmaq3ac8j/12367335453.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-4/20210704184415403420.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/14799648792.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/01b7166b2b0aae5efd7d5e3f19482c38/63232622313.pdfIn PDF document text
    • https://coevent.ru/upload/files/golixupimamuxas.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/9811298561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=definition+of+yulePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/66897761226.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_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 9992 bytes
SHA-256: f5d521a1db94e53925ee15270906133ea2010b54e962bf16e357f2af8704bb9a
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 16784 bytes
SHA-256: c51043b0ab0a1216717e6d194d5f138362a0dae9997f6407a2f7968f54054be4
font_02_sfnt_off000130fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1