Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbac18e47dba4f43…

MALICIOUS

PDF

85.5 KB Created: 2021-07-17 04:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2449f4cf171fcfebdaefe7f69a30850a SHA-1: 1a4637c8a4fe2fead6155ac34c13f8edb594c728 SHA-256: cbac18e47dba4f43c310d0accdf92a9ad94cd8f145c58c1756c6149328a6b2dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/bf50175b1eb4124f9617fce03287d58d/besenovesolimozazeromebov.pdf In PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/5942149751.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/48076748976.pdfIn PDF document text
    • https://deepex.hu/hirek/files/xogofusivi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9598e0599---44685835012.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/xogerumo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cc542e7ac---guwugulinukedomaradorafiz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095266fa5e55---xodeg.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/dedopamataj.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a05a3a58b75---20882657434.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/9926976600.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/sijafajotikosemavimibozap.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160705c1933dbd---rivefemoka.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kadupifelo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4ce4b5da27c7791c9b04de0da72a3850/5792506185.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f516cd70c---jemakikopetedawu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d531d2d1eb---60617279872.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ee3c8c51---68978478116.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/ronelobadurukevus.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f566409a625651dba082d7974eb0cdad/75337957799.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/90701299670.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9t522qn54908pb977489t7idrk/40051312124.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/970a310d0ed00a977a982f16ca75789d/pajunopozerijuna.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/87281445786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+put+5+pdf+files+into+1PDF 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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 10592 bytes
SHA-256: c85f4822f2729d5209581f661f7f3052073a56a0882ff6729c9d783396dc8699
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 16716 bytes
SHA-256: 01a5b9f150bc12c5a22c11e9e1de26671713afa22db511ef3afa2ec827f1b4c1
font_02_sfnt_off000130cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1