Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a36404cd36eedb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 06:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d52d05e22ceb829184be183420544462 SHA-1: 3394716352a29834b3ab19809ee3214c673630dd SHA-256: c5a36404cd36eedb0a6e239fd82c2c446f3322309738cef3636b741a3484fc85
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a link farm pointing to compromised WordPress upload storage, indicating an attempt to host or distribute malicious content. The presence of JavaScript and compromised links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c786e7fe95b3f855daaead580a24dcda/34587518338.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613570fca4439---15672685904.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/fatogizorofakikazuwalerix.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/48261353824.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/bipemijan.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/48073496689.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/paraxufinujavijumotof.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/98459108482.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360229d0369---36218342623.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/rebinuguvulozanutulamo.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/5389462180.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/88134146131.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/fowarupagezi.pdfIn PDF document text
    • https://recrut.com/files/files/wimigolaxamelopifofebal.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/vojamez.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/fufapud.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25171082370.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/57693146611.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/47707626833.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/73607131452.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/jobulugusi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ce157cdf---dogixozulot.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/57073382506.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/tugivekose.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/92423127245.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e1cc9f075f2b0875b3c6299be0f7cec/sunidesogilopoba.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lupubudiwov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=datepicker+angular+10PDF 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_off0000d165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD165 17888 bytes
SHA-256: 4205c41bb153d62f3ef45e4ee7274aa91c575be80657d29dfc12b052ade9f403
font_01_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 10628 bytes
SHA-256: 6f5da024cf807a19cb80958e283d35efde901b34e3dc84b3a374072795fd5d94

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