Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98b02a28bc3f0b7…

MALICIOUS

PDF

77.5 KB Created: 2021-10-08 08:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4adbe77b55e3d0cb10ceff41f82bd3cd SHA-1: 6f06af8d93385f8d3480151ed14b10b3a96f082f SHA-256: d98b02a28bc3f0b7bd74a36d3d24ff56bec2d9de41faa57256b8827fd8d0a355
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of a link farm pointing to compromised WordPress upload storage and disposable hosting suggests an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://saatyapi.com/upload/ckfinder/files/93924875719.pdf In PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/42157049345.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/jeniwosegilu.pdfIn PDF document text
    • http://mosjob.ru/images/file/girowibe.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161322d62e14ad---sumojuxemuwop.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/nakolufe.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/kaxiworekinomopisam.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/42524b70bc47e4f4a250bd2ca9083c35/zasimova.pdfIn PDF document text
    • http://changzhou.chinatupai.com/web/js/ckfinder/userfiles/files/sowekufusol.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/60360955860.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenazufebogu.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/944951395.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lirupedurizozusudoziso.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/37551181390.pdfIn PDF document text
    • http://hmed.vn/upload/files/79785309308.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/wonawosulavozeb.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/xebadelirare.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/74934918995.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f0fd9c375e---60288238129.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/subamumadegeg.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/43835864599.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/bamimetekokavizixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wallace+rose+hill+high+schoolPDF 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_off0000ca32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 10300 bytes
SHA-256: 914f0d0fbe018a5fe122a7afe61e139462dd129cb62633393045390bebc10ff7
font_02_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 18048 bytes
SHA-256: 18c0617d27a285be8b9e3db94926800bba7fbcf338fb89294c90dd09c23c6d95

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