Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f0c0e246c65095…

MALICIOUS

PDF

91.8 KB Created: 2021-08-12 09:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f40d4c51e6ba8f3f9184e445a2c3fb0e SHA-1: 777e30ef4ebbe831979a97747b5844c3458ae95d SHA-256: 98f0c0e246c650954c71ce2863f6b1d9427be5895ea1bc1aa705d0899bdf864f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://inwebjor.ru/uplcv?utm_term=carstream+android+auto+download PDF link annotation
    • http://cateringkieuan.com/uploads/userfiles/file/vewabera.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/mexumodawovemumoga.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a386f35a77d403b644659052dde80225/19774868128.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090fec0ba5d4---zupokitotemorejazizujuno.pdfIn PDF document text
    • http://teraval.cz/res/file/sigomululatagovoni.pdfIn PDF document text
    • http://brlairport.com/images/file/loladinoguvaveloxapub.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/dufenuvijuwem.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/36660533701.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3sdg9mker4950o81fs5q8ji883/jegore.pdfIn PDF document text
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/pisemevefonapet.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/938c9651e66d5d036a981888a09bb6e8/41286995392.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9127d262---wetusovebufanaja.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4433002ba3---11017305367.pdfIn PDF document text
    • http://humanlitech.com/files/files/xugagokunukusesa.pdfIn PDF document text
    • https://educhina.mn/editor/files/desodulaliridakuxovewiziz.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ae3ikfs89jv05ei0oll741vf88/zarewimigugilodedidizunu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3fa3347790db10f5919c1370f7cba6eb/92182938670.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/zoroxajokinefen.pdfIn PDF document text
    • https://brod-plovdiv.com/images/vunarawuk.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/dopifezesizalemu.pdfIn PDF document text
    • http://holzbau-napetschnig.at/pabebojiwezofebide.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64504602686.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d0e3eb31---55482870260.pdfIn PDF document text
    • https://harom.ro/files/file/gobilosekegawubiguti.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/gipegexerumasomob.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_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 17052 bytes
SHA-256: 54958e7c0e33475914d7f168975a0cc0cb951d0bfc7581cac6cf9a824c547756
font_02_sfnt_off000147be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BE 10628 bytes
SHA-256: 0e0ac3adf9b2cb5b0ebad8a3446dbe69eff2b5177cc178209df44d57d1f2a340

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