Malicious PDF — malware analysis report

Static analysis result for SHA-256 6115b8a889321897…

MALICIOUS

PDF

79.1 KB Created: 2021-08-23 18:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1392467f5a85e5e7d96c85686b7ccb3f SHA-1: 9e2a27f28a79894a2f8219914d48f4dafca5d568 SHA-256: 6115b8a88932189793076d8c9dcae143950fde16e9ac78035fe31cd056eedba9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable domains. These links form a link farm, a common tactic for distributing malware or conducting phishing operations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chatsystem.site/js/ckfinder/userfiles/files/sekoziguzimani.pdf In PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/kemegagejavidetali.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/942e562b53654a399c12f806ec845cd7/13375750374.pdfIn PDF document text
    • http://hanleyresources.com/images/megalakofopekigeji.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbdd6ab2ab---radufi.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/ramukadajuwibagakak.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/kifomenimufewipure.pdfIn PDF document text
    • http://omni-links.com/gewewutugidiparonobuxi.pdfIn PDF document text
    • http://deauville.ru/files/file/17085161142.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/76903384593.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/mufizodededan.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/tebibegetit.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608238d26cd31---12158341500.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/daea167d458a58fcb2f0d9e4dd819b33/mafumobasi.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ea12105d58c9d8add0dd9e7ea7895635/xemejesojezakapejomenumuj.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/juzefir.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/23483484183.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085fea0423d6---pogin.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/gisuwuvirejoxowu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tobrqcrr670cpim6o99rkr4s55/7551013920.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609165029f788---11001804483.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608004104cdf2---11828366412.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5feeca4f173837a0bb0edf55fdf050d9/gamidibimaxoxamam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=thailand+lottery+master+tipsPDF 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_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 10732 bytes
SHA-256: 5f79ccde1715dc4ea26c92f211342ceb1d120ff4ab06ccd3e5df80921ace101c
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 17196 bytes
SHA-256: 58fc8b7a7a9fb280ac8cca5b4d4f5f893a457306bba1f8a13187f52085d9b2c9

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