Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfcb3490029daf4…

MALICIOUS

PDF

86.6 KB Created: 2021-08-09 12:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 109774c7cd7489fc02f89f5fac79a72c SHA-1: 8052ee53514bc5d54441dde7bdb05bf23655b661 SHA-256: 5cfcb3490029daf443d3f5276045f9145a7f45af7c02de70ab49ddeb9029c03d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55cd67fdc1---34194518175.pdf In PDF document text
    • https://0286869143.com/editor_images/files/zesipo.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/bedexobekubilidatibabikur.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/11da0aa14427a6daca25883fe7233a4b/17406261796.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/milofutabijasatupawu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/20ub2jarobdmm5pvf5vsg9gb3n/3406560868.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/835354eee324b3a9cdf5e1ae17ae1803/mekagoromenunanibumabuj.pdfIn PDF document text
    • http://jucal.es/images/file/2168252581.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3812cda7---36846505357.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da7569d1---jovidu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/37906002305.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0977c9d2cf---50513751304.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ab082b1a5e7b7d3a98720237a70f49b9/dunijeruxoxoterulufovijix.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/muwumirodofafizixikibozi.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/2136039399.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abb2dc834f2---40456289446.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608503aa49ab6---24022405579.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/75539399259.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/lovenubuwufenijexavunol.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210805_094849.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab8f3fa7b---zerukezoratonituzenukob.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/891766f041847120aff63423d6079b76/81349927850.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517221937530031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+lock+schlage+door+keypadPDF 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_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 16616 bytes
SHA-256: 9207f2c77f91d5ef7b7634eddc632c14e63af64592cc7cd91cda9bccd5974bd0
font_01_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 10880 bytes
SHA-256: 16a38a265e883b6d50ad5f8246d3899dabaded1a408c083a84970aac33edc6fe
font_02_sfnt_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1