Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e37c8d781e29fcf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 23:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ed8e97264f83534d5af142094819dc9 SHA-1: 3c58e31f0348894075ed942fdac8980daa2b58ae SHA-256: 2e37c8d781e29fcfca743b6375bc9ca41bc6070c5105574f9738abebe20b067c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially malicious domains, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it is designed to redirect users to harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=free+watch+fast+and+furious+9 PDF link annotation
    • http://elpijisystem.com/file/bakuwuxotirerawibi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/1719886412.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tnuvacffue1n05jntg0bt4esa5/gosesezukoxupoduza.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140c3d9db263---vebifasonosegotekipogu.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/veriw.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/1615235045.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/40486225811.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c61695c308431c92bb1686d3e8c9a8a/bupagekosami.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/bezozilidizuburiropenol.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/tevig.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a188fb62bc3225c0f8dc59f1a5437779/bulirematuresilukukep.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/97937712310.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/jojukagivisewuzivi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n1648mpvj59ho1qneenic595c5/60891532067.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7abd7089385d8ce536c61d627817ade/jiwupinugilodijatimiwi.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/13800458283.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e4c7c7ca999246c13450dfc5ba671b1e/zaxizanijaworudakabade.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/vewevudakubozagufapaxetut.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/83464806648.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/72076214363.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///83888113450.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/13497838740.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/fidebudezemofiwevamifanod.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/16087452202.pdfIn PDF document text
    • http://rococosofa.com/files/files/92431656884.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/lelajilobukusarebe.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_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 10860 bytes
SHA-256: 639e747a9562dd30295b0a64726aef8a54eea7a30c59b17217aa6ccb5b520fbc
font_01_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 17892 bytes
SHA-256: 21411e403a721103e76db34b85f3c56ddf68802fba74273400cfdbb39b327092
font_02_sfnt_off00012d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1