Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef28238a0862823…

MALICIOUS

PDF

88.3 KB Created: 2021-08-18 04:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 257bb3da41115bd9c718ce2eeab0222e SHA-1: d55e7a59a3511bc333f6ae7049acb352883d1e6f SHA-256: cef28238a0862823deca19cd9a7fd462511d25cbc2c31d7a69c3aebbd4db2ac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=full+and+final+payment+letter+to+vendor PDF link annotation
    • https://ludifrance.fr/userfiles/file/fenalatelanuwarixoxupus.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/puxepobob.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/vubitiketewinemuv.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/muregibikazodatozerelid.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/xowakozuxij.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/57500561015.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a956c53775f---91787756145.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03f038d29---6248364426.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739bb56d9ca---kexefavoguzurujexozuni.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41318774777.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9aa1c03773---vanofilivosewojeseb.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/96qfvdkp2bnef96tdes66lp655/76398382500.pdfIn PDF document text
    • http://art-ball.net/files/file/zupozikisazikejitem.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe35b9c210---69495396343.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6gsct35ah0b7otp99qdufop3kd/fexopeki.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/tabulizogilewozosariwafe.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cde7fb9d90b6e937d58ea11105916267/46648487622.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6f111f60---1925758716.pdfIn PDF document text
    • https://linardi.ru/files/file/43704354221.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/518c7ef9a2abae0984a4a6da8c3e1575/vizolugutugogesopujata.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/98825288394.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ab87c975d6e33333803093fc2edf38d1/vugikaw.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/tozorun.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/290538596768.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/memikabatulutavirejiki.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_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10748 bytes
SHA-256: 2251709d5dac2c129723099ab938c4e98c78457e41607bb38c6e7519084bd607
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 17380 bytes
SHA-256: 5d29249734afa1a5d9f7c390839a02561ddecaf3d1c0b7ac46da08cffe624347
font_02_sfnt_off000138f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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