Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12f13d993b4d5a9…

MALICIOUS

PDF

648.1 KB Created: 2021-08-07 03:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e45e3aeb01d23847046bdde2f4b3f73 SHA-1: 065334652267ad76a7272a45d26331679cea86ef SHA-256: c12f13d993b4d5a9349401cb75f111f5b7578496594d8a0c8bcfd9c9ffe320fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm pointing to compromised WordPress upload storage suggests an attempt to distribute malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6389

Heuristics 5

  • 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.
  • 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://skvely-kup.cz/files/file/79660717342.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sl9vfpbk9rm43qjq2jkb705ln6/lilorekepazujukovapuzo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1d8687f90---xovikebifebefomirokusi.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092d41da7774---bujax.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a69adf09---92754045765.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/35803405958.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/15cd77493a39e013430c36f5d3d74ef5/68415060584.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/silokix.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1524b90d2---72387509135.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d1b83b4f596ab02b6df6fd152c732d02/nipupuzoti.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/pijij.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87c8a5635---fominalerigekifokupuwes.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccdd13360---95334617761.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/rerasasakadefigut.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/530f087681a4f0f4e6a2bc7a0a93e900/kagiwatonanomot.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d89c3af4f---68283462768.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/mekurifamixipudagipedulo.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/wovilokelumutoridiva.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca983ed57---waguzuwadiv.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/hrogj1jl7bma4l571g59nii3vr/xotefokebulenulodalibeji.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ccd347673709550e2857fc093cad6e73/56810021774.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/9353889384.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/93306443330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fundamentals+of+chemical+engineering+thermodynamics+kevin+dahm+pdfPDF 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_off0009a3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3B5 11416 bytes
SHA-256: 1af4eb91dbbeb15dbfb3bbadfdb4347f5027ef97130cdcef078849ad3e7a145f
font_01_sfnt_off0009be55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE55 20672 bytes
SHA-256: d11984b754b7fd2f4fd85d8ee67d9c1ae388feeb6c934bbb57b05f65ac976c0f
font_02_sfnt_off0009f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1