Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8011ae54824c17…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 23:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76fe9a54dc8f6f6b8bda32d8fb7588af SHA-1: 38f371f3270784976de9b600f572318e158ddbe4 SHA-256: 5d8011ae54824c17cf13be50fd7a1597680481e07d9610380bda137d555362ef
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to domains associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these redirects. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose as a deceptive redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=best+fan+made+pokemon+roms PDF link annotation
    • https://fsreloading.com/userfiles/files/mewixufozapuxa.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109160020503586.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/rexizujeraf.pdfIn PDF document text
    • http://clickvay.com/upload/files/98832792688.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xatizagibeganiveg.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vuwapexuniv.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/97752017716.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/34604649623.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/97237998160.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/nagix.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rejabuladire.pdfIn PDF document text
    • https://matratva.in/userfiles/file/66296811970.pdfIn PDF document text
    • http://brenderup.ro/mm/file/77814954040.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/59073123513.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/dovigamurazisakul.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/erb6ulrii986h437vc06sgmv60/gumovove.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/9321115321.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/mifipekawuv.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/xupojuri.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/gedimewepinu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d97c3694---namutonev.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/24965260226.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/m1hedkmnc1ejv16polab901m34/28329896590.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_off0000d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 10664 bytes
SHA-256: 6d1ce23f35ea86aded76b4ad11dbeab521a2888b566e65a6130675fc9c32f6e7
font_01_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 19268 bytes
SHA-256: a7ffe390a604a9839fe08d48a1a9d929ff22ef2f1e7d9174064b67dc64127f54
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1