Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bd32f4c795cd36…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 07:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6c7bea9604984387807902f56fdf46e1 SHA-1: 9aa0cded03fdd38c8742e06dd7deb4cf72ae1464 SHA-256: e4bd32f4c795cd363a54fd7c4155400e2a77b6e994265d26803a4d1026b5e8c5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous links pointing to various domains, some of which are identified as compromised CMS upload storage, suggests a link farm designed to obscure the final destination and evade detection. The ML_NYX_PDF_MALICIOUS score of 0.995126 strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://noticiascgnews.com.br/ckfinder/userfiles/files/73239442045.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371854d447c---sojisidozob.pdfIn PDF document text
    • http://lejonhund.com/upload/radetuz.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/newajiposelesetenesupiwif.pdfIn PDF document text
    • http://belovosushi.ru/files/xijusejamidomiwatezovu.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/84604276375.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/48070541400.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210908193119.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tusagowevisavojefudezis.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467829e892c---8169079372.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/6923223682.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/sogubutofinugu.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/39523766552.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc1a6096---23170633562.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614445fa53df8---kofedomirimapir.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325386258ac---fegoge.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/ruzudoxamowezagujoduv.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/97373332020.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/49201339299.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/xonerawovopadoxajo.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/35136989194.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/55435689551.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r51hp5p334vi2fmkp11panqtao/78244211069.pdfIn PDF document text
    • http://termocity.by/pics/files/kazowitobepew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=just+for+the+summer+streaming+vfPDF 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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 10772 bytes
SHA-256: fc2933da09eb4ce4f132f0f1afa9cf2532b5859a9839b39d7e78585830822e3f
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 19184 bytes
SHA-256: 96972a05fdc1e1b29a868e7861cd89dd04df72f4b0e3140d4323b139cff28732

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