Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f59515870b7160…

MALICIOUS

PDF

76.0 KB Created: 2021-07-10 07:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a534f5457cf6b0df14b14a9549ca04d3 SHA-1: 0f9ea0de4f977a1b44238346ab9646d03a638ec7 SHA-256: 03f59515870b71609795ed18884ee38d0bfed8919b1337588fa35417f94791a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the high ML score indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zionapostolicministries.org/uploads/file/repolibiwixulifivobixefa.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92dc82d6a---85591742667.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c40c514b---rukoviboxasoxokusafovok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2569cd8106---1797605441.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/9892339993.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g2t6emtq9i8sh42sll4sk92hg1/werivopijejiwogulifasefek.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebaba31a65---ranakulokexujazaxerasopi.pdfIn PDF document text
    • https://digicpictures.com/downloads/pulimuxagetufedavaraxuxep.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/zamomenuvukaj.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16096be73b37b4---jawifesutunuso.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d8c25f23---53342794879.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/161efe5b258c48805e22b49f5ec134cf/pamiwis.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/63328668961.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/89526424227.pdfIn PDF document text
    • http://vodnik48.ru/content/file/61064366992.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/rumore.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/63533232658.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8fc53f41---57899273859.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a96fc6bc476---16389415277.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb31312f2c---gukukulafum.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/dusonuzetexa.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/fegukebafirolawojaka.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/muxavefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+furry+are+you+quizPDF 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_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 16976 bytes
SHA-256: 88d169a73bfbbff29a6b894b40ec73ed2ee5567a733e217efdd26d2bec687168
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 10404 bytes
SHA-256: 756f9c78d8c526fcfa19a9b2867e3aafccb1c0eed34ecb27d352f9b348fdfe91