Malicious PDF — malware analysis report

Static analysis result for SHA-256 898fe5bbfca6b6ec…

MALICIOUS

PDF

121.7 KB Created: 2021-07-14 06:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c2f7078d75dd913d6d21769dbf8f155f SHA-1: 4de7b4811286b58f056e65f225f47ea494d955f6 SHA-256: 898fe5bbfca6b6ec514c4586bfed86a85f60ea44ed6744331dc357137fdbfa9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://krisoc.ru/uplcv?utm_term=plutarch+makers+of+rome+pdf PDF link annotation
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/41466187209.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/wepedadofewevesapaxejug.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/nidikeritakinazurowe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a83193119a735a428a0a0763344ef5d2/87133817107.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075afb07545c---fulipifozazefolup.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de82da42905---81820558463.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fel3tvlkaad77mub1t5hsi3hni/kaloxagevovigabemujesoj.pdfIn PDF document text
    • http://hcviet.com/img-phuctri/files/gukijuwutotovavegodazawe.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160784981e290b---83499388732.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/57f8db1352f1807eaed6ce2a0705361f/vavunifovu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f677c15cb---14781403024.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9gpbdrueu64d3orsgk0convimn/25140308817.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb73ef30cd---90947881913.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1fb39f03a---51169016365.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2e3c7474ce1e9d063ba83dadc0e26e09/tirele.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/bazaxej.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/38707772302.pdfIn PDF document text
    • https://superpart.com/files/xojunidisijenikovima.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609462710f6e5---63410304964.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/2379010570.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a54688c48b21856c4029880eb2510085/purorenaratexewalaxopota.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/4665527851.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/36664502494.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_off0001686c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001807e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1807E 26896 bytes
SHA-256: a2d561cf748c4c5cf375b955d25dee0d7b150fed8a1c6ddf19818d342e381e47
font_02_sfnt_off0001c04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C04B 10884 bytes
SHA-256: 2707a3ad36f5c4fd6b6d7c524e637844d0435b4f63c3ba5b7ac41885de2bcd43

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