Malicious PDF — malware analysis report

Static analysis result for SHA-256 d073e9816fe7e489…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 10:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b7fb5760a208ffa37725b59e746e545 SHA-1: e39007bb4145c24c5fe6ed5d4fdc159e8388d804 SHA-256: d073e9816fe7e48957d63070dbca502a33ceadc393bd1806ef71cdb3528441d4
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing. The presence of embedded JavaScript (PDF_JS) further supports the potential for malicious execution within the document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4602

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=chrome+download+webpage+as+pdf PDF link annotation
    • http://wienbildarchiv.com/upload_files/files/25223853034.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/funikoxinapopeze.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/xejodajimalekorefikawuz.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1232c9bc2---83112066762.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/99723845648.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e4276751---50035424207.pdfIn PDF document text
    • http://darstin.com/userfiles/files/84881990281.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210903145316.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/864j2j09t3ud0asufajn2er0t2/14685639965.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/15950182052.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/funegadunezofeneb.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/kijijibufezuxa.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/46756842197.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/14381728955.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/fosamajefusuxe.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/50072264390.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/18659977490.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/bqeui7t6k31fpso3p5sk24g163/53085823679.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/38927062799.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/nebuxafe.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/tuxatewogenugex.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/mibesiliganilegusip.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/65388565127.pdfIn 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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 16820 bytes
SHA-256: ee5ada821e97e243f8a099e24a279e5af716608e24a6e79585ba091886422c07
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 11012 bytes
SHA-256: 52473631abac2ab55f7b6766c6111d759b8c9b0e526447352f28cab5161e8001

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