Malicious PDF — malware analysis report

Static analysis result for SHA-256 953e4aef3570d867…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 23:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b911fef4c84b566a478de7b6570e4fb5 SHA-1: df253672061524c4a91bfa25f03f12cd6f7b7f11 SHA-256: 953e4aef3570d867ef3e09e738ac1eecd48b012e4a45c87d5630ca0699c0deec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are identified as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://hoongnau.com/upload/files/digigijivomifek.pdf In PDF document text
    • https://seeyounow.net/userfiles/file/65913197895.pdfIn PDF document text
    • https://empresa-venta.hr/files/11343951517.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/9601059762.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/nivejakizabusogab.pdfIn PDF document text
    • https://emmaushuis.org/pages/98717117545.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/69509677083.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/39584665085.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/28535748909.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/22339887723.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/powawalegeka.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090708465621.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/81294787911.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/13ddhfepaurgvvk8uh9lpmon70/2070812427.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4055f327---28395391688.pdfIn PDF document text
    • http://airmon.hu/images/files/27407593034.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec38f1f93f---zaveturalot.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/melinir.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/koxid.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/zalawux.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/kamoduvizosap.pdfIn PDF document text
    • http://jonellchem.com/upload/files/49781038080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=app+viva+videoPDF 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_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 9916 bytes
SHA-256: e38f3c71b8c81fce2a2d1feed4d70d0244e32165288dd23c8e1fa33c13365eda
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 18256 bytes
SHA-256: 458446e6d49e13d2e433f80800cabd639a20a47265cdaad2789221d02907f4b6
font_02_sfnt_off00012cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1