Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6241575c9da672e…

MALICIOUS

PDF

85.9 KB Created: 2021-08-11 20:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abd2d4937160e429be74428361ee6195 SHA-1: 389472bc1b204c3b6fb8f872ff888d7e8553dd65 SHA-256: c6241575c9da672ec20ebb2951cf08bb97131ea6f3a58fcff8b8f8daae3db15f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160766892965b6---17966207296.pdf In PDF document text
    • http://amghanoi.com/images/ckeditor/files/98590429232.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8ffe08ec8a7327cdf15a24c26c5fa28d/14806392554.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1e63489024d8a9095c2114c6f7e3f2df/89507811976.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f97939b0fe1a571361358933b8ac3fc3/zogegokafazujon.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/gikalowisusenakigaragu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d97fa3433d2dee58d1899becd0722d46/20519875193.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/mukunigelabavifa.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/371699272.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/zagurupumumowavituginug.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/20935412305.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/87593593459.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/72658783264.pdfIn PDF document text
    • https://bataretak.com/img/files/file/42785244726.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1536ac0858fad79a1a934b5a48a7b0e/72658988241.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e358bb1a96b---pezuxadasusawo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084c32e76b1f---lokibijixixukegiwimina.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072195b9a124---salaw.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/mokodapalugosiretoja.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/53mrc9gk6hih33c4tj3jnkaoj9/91135560774.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18c27e0361---26445052424.pdfIn PDF document text
    • https://12waktu.com/contents//files/76331355333.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bef966ec5---37061208866.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a548d98c1---kubunebupolafu.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/moxibol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=excel+vba+copy+rows+to+another+worksheet+based+on+multiple+criteriaPDF 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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 16880 bytes
SHA-256: 84ddd36fbae76526810011d6c657cb5edd864d5eb32714afd4be18053bc01a20
font_01_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 11464 bytes
SHA-256: 8b7b2dac3e48a8a66ace58089034870d1cbe15bd5900a9c1deaf3afe272d5110
font_02_sfnt_off00012fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1