Malicious PDF — malware analysis report

Static analysis result for SHA-256 57390fb4f636bdb3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 09:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73e1d9f7c4a584991ceaac36680567a2 SHA-1: fb20f072c9fd2a6f578933025a013615c80a9918 SHA-256: 57390fb4f636bdb3678ac6a411919dbc2db2df31ff6692a85c2ea32a0d8e62db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised CMS upload directories and disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://chcial.ru/uplcv?utm_term=solo+life+so+better+full+movie+online PDF link annotation
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jukdqsns090tf545pelm7ftjk2/narim.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/59374999853.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vu19gri537n7s0846bbd2h22u4/50412229148.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2eu6onu56dr6s6olshv1trcrv/82208215000.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/denopikenadowozeji.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d7583f6a17765a519bc240776af0de3f/puzotew.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/cf1769c3c3db4462a5d37e2b2e89aa77/80385875960.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/paxujujep.pdfIn PDF document text
    • http://starma.pl/files/file/mojazalegowuf.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/10233874691.pdfIn PDF document text
    • http://clubberia.com/js/ckfinder/userfiles/files/31329928841.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/8466837631.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/86827819813.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/96715266735.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7cc310799---76966232658.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/rimireloxivenizupuka.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/45428062456.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/47714412767.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/36350705871.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c69c6b9c06---delujilogodigazixu.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/pasifodoguwib.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/17113782040.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/mebizito.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/29878533687.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_off0000b035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB035 10596 bytes
SHA-256: 86dd2c4924aa97d23264424912432003759e20801d9f5ea227eccb73f6a986b9
font_01_sfnt_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 15128 bytes
SHA-256: b828d71f36d207eb2ec51e947a0d1bf29cc5901c1cbb3ece26f690eb4c56f12b
font_02_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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