Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b7e5ff2a85cd0c…

MALICIOUS

PDF

80.1 KB Created: 2021-10-06 04:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c450d51bcb057128f15fb9f13828b3cd SHA-1: 7fe956bb1825a2252a98c2a72464e5b883858768 SHA-256: c7b7e5ff2a85cd0cbce2abc26c27c85a9dcdfd60070858aa94847aca5e6e12d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://pokebarslo.com/uploads/files/toxatafuwup.pdf In PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/11237838260.pdfIn PDF document text
    • http://ponozky.gultio.cz/webpagebuilder/ckfinder/userfiles/files/93626312300.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/1846491785614231b8d64cf.pdfIn PDF document text
    • http://suurelepa.ee/data/file/potajiwatuvulafulelasepib.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/53609538129.pdfIn PDF document text
    • http://sjhtractor.com/d/files/83997394394.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/bazopudakejupunuzikixu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/769ba6600129b81b58254c1915f69f8c/67725490628.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/22949342366.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161457abaec3d5---15335860258.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158e14483071---zifafubexulesekol.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109170918235267.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/susazejenuzunuzomotumam.pdfIn PDF document text
    • https://tekartltd.com/upload/files/17676197141.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b161de524---156921707.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/52824446433.pdfIn PDF document text
    • http://royalgroup.at/tmp/nelokagejepekivulu.pdfIn PDF document text
    • https://digireg.sk/upload/karubefosaledujorov.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/kamise.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/75569375617.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109190736197710.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/japufegu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa52504852---xarowepijifupediruzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=henry+purcell+dido%27s+lamentPDF 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_off0000cedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDC 19184 bytes
SHA-256: 60ade28e309cc460002faeac00f616fa75309a7c3470b085c1bfa955e3a94872
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 10912 bytes
SHA-256: 50a7543a3b715c4f17c4b4ed4a27670b599dbde71db5f338a480273bfdb8efff
font_02_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1