Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c95377304d24c79…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 03:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bdaac4aa6db9a81f8c80a8d211a81d3 SHA-1: 017a11c23321fceab9fb59f5b530e2f1e40462c8 SHA-256: 4c95377304d24c7979c4d0ea65329553350dff8f41c80dee1149450d710c4023
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=export+import+bookmarks+chrome PDF link annotation
    • http://racecross.com/upload/edito_fckeditor/file/jugofe.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e167d065aa6cc4458bcb1c8bdd037e3b/wibenadomebigosepof.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25baefabd---finodozupivabimoj.pdfIn PDF document text
    • http://japhina.com/upload/file/venupisazawapenigimexez.pdfIn PDF document text
    • http://someteme.com/archivos/_20210923145357.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2r4ufkfgpv8apjg6v4lk9v6m96/pixogi.pdfIn PDF document text
    • http://bienbao.net/uploads/files/fenib.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613db15448753---99862602837.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/54204990398.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1e42311d36f3b13af714bdbb119fd9f8/84108079722.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a782419f51a08eeb1c49ea5a3b5a8cda/komafalijazupeveruso.pdfIn PDF document text
    • https://fishuntpesca.it/file/12319615020.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/gevaper.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/6303002870.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/8097777747.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/xifapezobubobetalal.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/temojinajekaxopadesatenuf.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/fowudamevuligitexod.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/gonojemirisedu.pdfIn PDF document text
    • https://medtek.vn/storage/file/gasurovolawafubigemi.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/nuwuwebugijoxisizulomade.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_off0000adcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCC 15640 bytes
SHA-256: 0560a74acd5987a99617b9dc95a5b9ab018cec15f84ba2df0bb643302494fc55
font_01_sfnt_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 10804 bytes
SHA-256: 3fd249e4950f3f07c7b74a425c7482c03655105494c86a3b46debfd10112bcaa
font_02_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1