Malicious PDF — malware analysis report

Static analysis result for SHA-256 337cbc05b04b47c7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 16:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a5f8b627db005ad85462db9819c7e9d SHA-1: 10da98d246f9eab4ec91f29f676e4761336f1fb0 SHA-256: 337cbc05b04b47c72d85de6bade4cc5ab05e3de9798d4b0bb6558c1e2665e296
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://philabc.ru/uplcv?utm_term=anaerobic+pathways+for+atp+production+worksheet+answers PDF link annotation
    • http://xindeshiye.com/uploadfile/file///2021080818422717.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d20aaed57c5---61677427879.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7dukedfepn7gm5nf808d64sj10/napekilifisi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119408ba8feb---fegerawugodunorodil.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829a108886e---13882315811.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/zoliwusekaxusazesitetas.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/livevimuwefadufagowasid.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da61f89c8c---rexoj.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5cc9db6fd6c31f1bfe9c2be5d8393edf/jebut.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/55484154971.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/35ea7f5756ae7cc004b95859830cdb8f/93217317202.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/defigadepividaxinanoribe.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/89923935720.pdfIn PDF document text
    • http://markone-tools.com/upload/files/34212719403.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/dojufikepabiwoxika.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/tisapotivekalivitixebo.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/78742476137.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/tesejokuwinif.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/zeguxumunixosakilezomak.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/qvdgovvgpdud0b17u6bfo40uj2/fatobewurubabepamu.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/vapezozegabenute.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/jazubolapofoxevesumoz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6d1dd36b7bf5f7857c1a3cbab3d68aaa/90713176037.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/mozuxawogimizerifoteb.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_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 11184 bytes
SHA-256: 1ba8285b489d3819d60dfbefb0b5293b24fe4cf6909443a4b8a4d80c76eb6541
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 16276 bytes
SHA-256: faba124bd21c807c1c12931e10f4665e2a406d4fa45cb2169520525f572a1e89

Open this report in the interactive analyzer, or submit your own file for analysis.