Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fd9f3c9099b91a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 06:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b98f42d2304e52ded19a9fecd099ba1 SHA-1: 3786a17bd526d944baea35e603c0ba58fb424456 SHA-256: 52fd9f3c9099b91a67845a13cbfa0543672b9379a363ecad752cbd58520646dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=cancer+de+prostata+patologia+pdf PDF link annotation
    • http://debden.org/userfiles/file/76054440798.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/tesujujudari.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/50309874660.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c182265eeb---leladafumozivo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa775ba30---44508335766.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f9ed8e824e4756e393211ba32f56a608/zefariniduvuzidu.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/78712006068.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8c87bf15f---22492575846.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/navewexabazixamogagave.pdfIn PDF document text
    • http://uco-kampen.com/media/files/levalamaderonatamexutipes.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/legikamajiwepifu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135a383502f5---16985969116.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/jamuzibigemasoto.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/757c944769d613e83aafc60ea39d9ad0/8101742488.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/58650243288.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/11384510780.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/pidadunof.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/kumoratufoki.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/24391887803.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/30/file/20210830_015519_146.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbj0b9pmn4a5dmoinamo5j17pd/14112018848.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6a12ea30a431ba6612e29146216d048e/poweganu.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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 10824 bytes
SHA-256: 743f9e2a0e65811eab024e5c05349e60a8697e1033bdc1de911e3084656784d7
font_01_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 18756 bytes
SHA-256: e718cbab9148717f7935251be2a07e9ded5a44c3a469a9b20b6796561da18503

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