Malicious PDF — malware analysis report

Static analysis result for SHA-256 9090e291c52a2419…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 03:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcd5b62a009b2c7a499bcfa05ea54e15 SHA-1: 713161093d8610dc8f98a4e9a99ef244519d0710 SHA-256: 9090e291c52a24193a054b273c1b8c0afb7bf54497c9ec0661751ddcbc852b63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs that form a link farm, directing users to various domains, some of which appear to be compromised WordPress sites. The primary function seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+erase+contacts+on+android PDF link annotation
    • http://assotechne.eu/userfiles/files/tojitivexawexo.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/nulewuranividasefezif.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf5bc25fe---58051131348.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/89bf1086609cf0c2eb12e9fc55c375e3/81429814216.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630975570.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/sofivadumavamuda.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/mogaxewi.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/95706012378.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/rupesobetufolok.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614168a20c264---zawalexudejupexamafetagik.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/16720333997.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/nedudulusirurufozusuri.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/saloradimo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f5980bac---37015316193.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/vawemugazemasa.pdfIn PDF document text
    • https://soechi.id/userfiles/file/63935671621.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/59509797149.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/51269746247.pdfIn PDF document text
    • http://baove24h.info/upload/files/lopazigexes.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/letutozesipo.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/54312930790.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cc81224c---porubagafaregiguwoga.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/51026492546.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f40d09a5bb64a2be3404bf9a67a7d199/duzajamivudebal.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422629769d8---62120249552.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_off0000b4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B1 10396 bytes
SHA-256: 72aac0a7635d704594ea5fc18aa0544a3bfb18da1da78a786634501c582371d2
font_01_sfnt_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 17292 bytes
SHA-256: 4003cff0eefced3f724cbacde273104d2c928e6706664678050dfc4d6243b446
font_02_sfnt_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1