Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d09fa5fc074570…

MALICIOUS

PDF

82.5 KB Created: 2021-10-08 06:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: da4a46b25df496fee97d17946f9aba68 SHA-1: 61e337974d6c9f96c3e10fbf92e9e2e0c849d679 SHA-256: c4d09fa5fc074570713f18168f89e2c6e2341ecd4479ed8883aba2567449d6d6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple external URLs, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://budgetparking.ca/admin/uploads/file/31864505533.pdf In PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/19488591269.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615101a77a131---4810298674.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/25368643989.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/nilusokuxufo.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/xigokalikabuvipeni.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/vutozegumumixigejar.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/60266789153.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mizuzanosajibadusazabi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/otoj33un7as9vjroaq9rv74s36/tejukofufe.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/2139899965.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/12820924772.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/64126255379.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kogibaxevirinufasofisupib.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1615ccf710b85a---71127247303.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9bcdve5h43ouhnscvcnpd4plpb/pisimupokop.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/nomijumuvegirudubibidodad.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/wajavexonifewi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee47e2341c---27464278561.pdfIn PDF document text
    • http://fabtur.ru/upload/files/10766623222.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/48422926914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+weakness+answers+for+interview+questionsPDF link annotation
    • 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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 17416 bytes
SHA-256: f484fb534e8bd0f5940bef1a3e24f23c405897b9f736e36f64d8a17b743e5a37
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 10704 bytes
SHA-256: 3a119d6305bcb7c7d83843888d78ad49f5376949ad686262f915b3d04438f3b7