Malicious PDF — malware analysis report

Static analysis result for SHA-256 8191194f8b383fb7…

MALICIOUS

PDF

76.7 KB Created: 2021-08-08 15:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ab7d3541d5f38505f44cec28802577d SHA-1: 63c24cfdb60f258c2ca6fe5ebe6f80f456b73748 SHA-256: 8191194f8b383fb7175968a31aa0b2fc09879b0b625382237571342032a39ca5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=animal+classification+worksheet+pdf PDF link annotation
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bdf822d2c---zigimaxatesa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1587de462015026142dbcebf8657eb8f/bamimujoritamodoraxup.pdfIn PDF document text
    • http://riceart.ir/basefile/files/68394724410.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/33207043507.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-19/20210719014915182007.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/89910017822.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8428c48427adb67a0417693e525df835/fitoxufijazen.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3e911f01b0e4345c293d0a8c8bd71f5f/rapina.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/ropoza.pdfIn PDF document text
    • https://esvigo.com/upload/files/xodifajonapomogufuto.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/93278510397.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/41894568203.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816fa707bbd---128545381.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/20477652234.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098d50103e82---50989802646.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/wufubon.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b8966ae019f1155b19eeea431523d1e3/delefoz.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e1e02d7141274872e336ccbc3961793f/pogiboxu.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/zemaku.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/94825540815.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/waseda.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1op3ovk368dnea05m2l09todo2/20792963794.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_off0000c3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FE 18908 bytes
SHA-256: 483d5640b335b48d12cfd10d1d89c00f828a330079a7855806bcb9d6e5377462
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 11044 bytes
SHA-256: ccc7d4d1d7ae8e95fd7371e756d9fd01a2f5e2b1172e19e432d3a3cfaa4ed74e

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