Malicious PDF — malware analysis report

Static analysis result for SHA-256 df93b426f3f091e1…

MALICIOUS

PDF

88.9 KB Created: 2021-09-03 22:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f16fcc95c2306255d4c53951079dc45 SHA-1: 8d188e0598f690f573ecaefef680b145bf002b13 SHA-256: df93b426f3f091e13eb12fc8e97bbf116fd152b3f21f51b6b3fcb4ce27cb18c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://catamma.ru/uplcv?utm_term=tremolo+harmonica+notes+pdf PDF link annotation
    • http://fmi.lu/userfiles/files/72278350659.pdfIn PDF document text
    • http://agro-partner.com/Image/files/lejiduragizoginif.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/xagosesizofuve.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pexudejafivafusitofu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/49783798095.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/guvumuruwidekanavunadit.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3e2304602---99216872102.pdfIn PDF document text
    • http://topas.lt/userfiles/file/52847311638.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/pogatosevewelad.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/aa9d2f7de9c51c285d0e8dccbf1df883/65608957052.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/72966943698.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/16828230781.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/kedevobemulax.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dcd5c52e382a92c5528c25ad3dd2b08/kodeded.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/12d4a8d0ddbf0d0f09ba37b2a24df873/68133538351.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/71003698308.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5a4b9172e86546f10a12131e42c04630/25652037569.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608abfe24a67e---gadesilis.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/19797822959.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085065e11b04---kusibis.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/19014485304.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/20119738360.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ve8ks0j24kiceetqvjpe95nkgr/6083044726.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/wegodumoviligixalex.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607654257b3c0---98275001995.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/lebobagejalotosuxarime.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lipatumevopukofirez.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_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 10848 bytes
SHA-256: f982b5d06e7413ccf51370ef0933ce3c20de61d49b66cbfae73f7b1f1ffc0cd6
font_02_sfnt_off00012661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 18308 bytes
SHA-256: 5118f13f23b3edbc5bb680d86c9dd2e383843dec4e0b91ddef52170856bf9849

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