Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6148c81fd24eea4…

MALICIOUS

PDF

92.8 KB Created: 2021-09-04 09:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5339082057d7ffd51bc84dcf247a9bc1 SHA-1: ffa466349a1751955452c1c124aa26bb4105edec SHA-256: e6148c81fd24eea490ed4c256ab0e45aabaa414a1c99093d8523389975cf4601
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 it is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://baugeraeteverleih.de/benutzerdateien/munowifa.pdf In PDF document text
    • https://digitaldaya.com/imagenes/file/filafutuxusifesuwi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5i2iasth385ugn4ubnempdlo45/92979601438.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/gawixekolexumetulopaso.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909b70077e9---50960643662.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/095bf510ddd49dd27126627f237bb6f9/95076219201.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/40177183565.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/73146566464.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7d39f554---79173596219.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a64af0d88---katotibogoma.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/jadajugalenodomosu.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/mosuviriwus.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/vijivojiwobuvusepo.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/17443287939.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/29873958032.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf12245ff---kazonekuteludaruwex.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608df110a7447---38913727670.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/72777191521.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/pevagalivewobij.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16103d41111827---29000941575.pdfIn PDF document text
    • http://winso.tw/userfiles/file/muzijaxesusevuritej.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/leferedejurewometebiwaliz.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/mapavuwugad.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f258fb8232d5a320e6588b3739023789/zigojewixebeb.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e958dd30f---tafataxemokulixemexegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=practical+wpf+charts+and+graphics+pdfPDF 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_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 18644 bytes
SHA-256: ea0ce89c7687ec33d790b255fcf236015a12c177f13bcac32bac5861f9bd7ac9
font_02_sfnt_off00014d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D43 10732 bytes
SHA-256: f98d7fee79b031b2964c82f43479ad4562f32f00ebd988d2a5d63a63a97fafd6

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