Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ebf2dd24041fd7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 02:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a40c8de8807563955dc7d05d0503066e SHA-1: 067242c9731a6b45230e24c63fab786d577a7b11 SHA-256: 52ebf2dd24041fd73ddbe70b9c2a4f1d7f4f6c91f59bbaee090e4ad64cf30279
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 and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=calorific+value+of+rice+husk+pdf PDF link annotation
    • https://equinox-e.com/upload/files/99298805843.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/budulutosomorexo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d7ee275a75b6b5b8b18e43c95ba9046b/wejajapuzulup.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/jugomikufedo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd90ac1cc8---rojosutametilariviwela.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/89096662191.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fd5bf3695a9517a385519fd89d2fd1ee/wesuditobewekalow.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/zovob.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/suzegitezoxojisavufomid.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e9cdd63f---zoluw.pdfIn PDF document text
    • http://cy2hand.com/userfiles/zemetodap.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/pinolewipusibagigi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609184a322c7e---73225822249.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/4100750266.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/31ddb3d7de79bcc22e498a389fc0b29d/80220095824.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/nabamowekovitijut.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/52960610611.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/fisubatefutuvujuvamopu.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/17833898635.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zodalawigi.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/2996191442.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/tipofujenotufifamomuni.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/togeribasanofepura.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_off0000bdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBC 17284 bytes
SHA-256: 445224710f8244498cb189807c32af2d5778f5c8d72d36f1653cb314f62303d2
font_01_sfnt_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10804 bytes
SHA-256: 887ef9dce03905de903423f2934fee8bf1b21281e9e35f16dc2b279b816d41ea

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