Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2d0da0fb098a6d…

MALICIOUS

PDF

72.4 KB Created: 2021-08-31 13:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6296a43b4e1caf7e20e2995c47e831cc SHA-1: 979647af4ab35102bee7faa82bfb0a4b21cc98da SHA-256: ca2d0da0fb098a6deba4ac9ebd6057bb7056abc23a832c6aa86a22d005ac4635
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages, indicating a spearphishing attachment attack vector. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa88c57b460---42530855848.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8b9b0714ee9691739e4599fb11419510/wuvavawevepugejeli.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af34e6637---70362957970.pdfIn PDF document text
    • http://ore-processing.ru/d/files/92874258621.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/mokobuju.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/23c0835df1623ac7130b9b3a90f2620d/fimibojeposejulasodawavu.pdfIn PDF document text
    • http://linker-apps.com/files/33409505193.pdfIn PDF document text
    • http://didula.ru/img/file/nafavetuwazulotalu.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/62387635597.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/50776640701.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1be9c82d18d9ed8028ff9ae71b336682/98167726348.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/puwifelifadolurinide.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085257c8513c---84184780798.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/67534089184.pdfIn PDF document text
    • http://rotang.net/userfiles/file/73266668488.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/5c69d036c0454ce5c230697da184baad/91518532213.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/wirisetigoxubafuson.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/1685818866.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/99135363489.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d741b260ad8---jiwubetigupigavizeveto.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/fofedasezupawuvewixa.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/fexaz.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ba68ec4cdc9bdbe9161f56ef35feef67/rosira.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/b98q7a5ho7t7kik06i9v1r1666/62575959754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=upper+back+pain+hurts+to+breathe+and+movePDF 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_off0000bb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB10 15368 bytes
SHA-256: a47487d52b87dd4206ce397d8512ca8e1b8d3afb674188f1b72ae37a500b0013
font_01_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 11140 bytes
SHA-256: de667afaf6641792d8cd8ffa4d0cef8729ab95f039651df7f57a8e0a16ef4596