Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bf9d853a335368…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 17:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2be871b74c242bbc3bc2b81799d54f4 SHA-1: 46cead23b5a4d6ecce42e80b7b4a468fe85149e7 SHA-256: 05bf9d853a335368f8d56fbd8b94ef636022611aefd4e821fa8b0dbc4875cef9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

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://smidgel.ru/uplcv?utm_term=dumb+ways+to+die+2+apk+download PDF link annotation
    • http://www.jasfec.com/imgs/uploads/37794385375.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d626da5f13---punuwujeb.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/mixavigoz.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613748e59f767---sigenidebir.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48231955374.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/jabomani.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/29875731899.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/57758213700.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/55559512746.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/zalejutepimof.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mimiraxerugamubidukaz.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091122475173499.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/21698132053.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/31699621057.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/2916635176.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6ab60e4e0507c46fffdc0488892d4dca/kapusapetiput.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/sarazix.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/8015840275.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133d808a3cd8---39587733743.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc6208b27---fuvav.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///37586037744.pdfIn PDF document text
    • https://cityface.cz/res/file/17456921531.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/xavanivavus.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_off0000b6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BC 20084 bytes
SHA-256: 97f5a2b24f156312743c9fff2dd0520629c877a16962fc36cb3115f0bef89716
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 11108 bytes
SHA-256: b8450bedba466ad591d0817a1ee97d0bd867ef843225c2bb135ba48729a463d8
font_02_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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