Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b312c1702facd52…

MALICIOUS

PDF

70.3 KB Created: 2021-06-06 21:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 13ec29d6ac8512deedd04499d61e020a SHA-1: 3db7eb54e5292765720e81ffb447a4942ee4ab23 SHA-256: 0b312c1702facd520880b49f53512e44ed740a623fd7af783b44683d25502fbd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF is classified as malicious by an ML model and contains numerous links to external websites, many hosted on compromised WordPress installations. The document body, though heavily obfuscated, appears to be a lure related to 'gizmos student exploration water cycle answer key', suggesting a phishing or social engineering attempt. The presence of embedded URLs and the nature of the heuristics indicate the file is designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9430

Heuristics 4

  • 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
  • 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://philabc.ru/uplcv?utm_term=gizmos+student+exploration+water+cycle+answer+key PDF link annotation
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16087562042a9d---lovixikezumufexa.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a056ef4082---zexerotijale.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/su4apti49iig7tmn04saq2ft61/69467043570.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bec3110b9---34920057660.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/0b6ec34f2a3634d1885a4416f512252f/vetuf.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/mofinogadej.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/20099758508.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/86552288e23f53126901f24306489834/29193228864.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160939ed09561b---3280319643.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd2c43ed9---37759724079.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b4022bd82ed98a6d09bc29666c8b5ac0/buzimo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a739dc4a---12782093987.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ff39742818b72faa1913f2524346adf7/rafenifufutepikubazes.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/97573907665.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8da83c75987d228c23efcaf7d390d7d2/4452404007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 5508 bytes
SHA-256: bf037398ce27172570574d150911818e1d92ee8b324630b4ea6955893b13841a
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 10876 bytes
SHA-256: 485c3e812ba1148db915d230f11a31b115459e9288c86e7fdae10c4c02470938

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