Malicious PDF — malware analysis report

Static analysis result for SHA-256 648d50dd70a3984b…

MALICIOUS

PDF

76.4 KB Created: 2021-08-21 20:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc14ed7d7e85fbc2127119e4160d854d SHA-1: b1db6fdc92ba70946cd566b054a65d55649ea5af SHA-256: 648d50dd70a3984b12356054ea709f7881d635d4191b653e22f81f066c3530a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate it is likely used to redirect users to malicious sites, potentially for downloading further payloads or for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://narcisse.sk/editor_uploads/files/zinep.pdf In PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/25146820223.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8337a7c91---kumarud.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/32f5515770c9dbe80f9fd7a3a966f824/97726772381.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/72768091044.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/9020860002.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/78558658682.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6bbbdd63ad8729d2a73f5b0cd8225b0a/96238967491.pdfIn PDF document text
    • http://nktrading.qa/file/files/96447399568.pdfIn PDF document text
    • http://gptools.net/userfiles/file/lejitigafenedazujukokaki.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c48a1238---44057633127.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb86683d2---mesovoxegakiku.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/03lk8rcjokgc1um2b7aifs4pt4/52151140176.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/74297986361.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/45407175009.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d16c19ee43---19914573683.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/ledubuguk.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/61936541600.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac75b240b---lumaz.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/61a0e36f0a9970222d07c7d2b92e3a0c/32660323420.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/57932701726.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/40888107810.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/36782981554.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829f63a8bb8---fosamasefajibesafab.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bb5ecf295b6cdda7a8d33baf00f10c56/56700443813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=reham+khan+book+pdf+in+urdu+translation+downloadPDF 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_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 11224 bytes
SHA-256: 2adc2b4e4d2e17d60c2be9d90ae71a3a87b40e6852ed2e9d67aa64d0a464ba93
font_01_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 16272 bytes
SHA-256: 8b0d3fd88fcf5a68a0ba7f1d86fadd111c968e43c28d164720297a4ee8c37cbf
font_02_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1