Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19058349986282c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ee52604911d5bacb6de8a4b5b135bdd0 SHA-1: 93875d39db289b776ac475f3dffc7de6f60e6da7 SHA-256: d19058349986282cf9e3259b25db6fb7c6400343d9afc93f3935e56a02d46fb0
164 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 embedded JavaScript and a link farm pointing to compromised CMS uploads suggests an attempt to redirect the user to malicious content. The primary attack pattern involves leveraging a link farm to obscure the ultimate destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.llmhospital.com/www/js/ckfinder/userfiles/files/gekigon.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1a2e1acd124715a75b76c43bb412436f/daminubulatat.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kn6shvil4rcmocjfisg44c1k16/73235083241.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/sexudirub.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c31a48f1078b554cc0a660b47d0d3a64/kesada.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/sobejalirepoziwimewogan.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed9d759056---javipatu.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210803084336.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/43413162847.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed2ac20d7---kevebasepanerosikeverugep.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/2787205356.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/37596520109.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/87833625110.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/sejefitujujarero.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a117286f62---67194607135.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/a7kdoj729eb25vc1olaur18rmi/59884794154.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0047b7136ba3f972fb7bd7fb367d7f20/wiwalewodejukuj.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/30003538628.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/93459949525.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/fofuro.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/10385070211.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/54165007921.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6e98689c0483433a53b570dda29bfc4/1741489031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=out+of+date+ear+dropsPDF 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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 17608 bytes
SHA-256: 9facd1aa684fba0e4dbeae709089b9c6a07067b303c92223bb063f8da473070d
font_02_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 10372 bytes
SHA-256: eea18f56780cb7495ca839453a4e8ffc2d931c44151a2a90d0ab146d5c22fb73

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