Malicious PDF — malware analysis report

Static analysis result for SHA-256 11966409b2503902…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 00:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5eef306cb6eb2221f5cb8748c5e0a73a SHA-1: 1e86624728a2a47e99df571869b4b75d2f4996a1 SHA-256: 11966409b25039027f8cef66a7d25ac03d6ebb159cc9ac8514345ebd7c240b10
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of multiple distinct hosts and disposable hosting indicates an effort to obscure the ultimate destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=no+rule+to+make+target+linux PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/08027570518eaa822611a373a89b9828/saxevomezozupisotemezu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/09f7e0aac8a4898307b1bfd11d9ec89c/dafepululemek.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fb300237---wovemobebodozetoxed.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/ponusebodegawalix.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e09a6f2762fa2b56fafafea6dec06ab7/dubelenenenapege.pdfIn PDF document text
    • https://x-software.cz/data/file/76717253791.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6458bdc6---dutatug.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/tunadolapuwavanojitun.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/ladanaxekuximu.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/tavibaxikiluvojavavof.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b7652e3b0---21402758980.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872148a4ada---luvabowiv.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a194b39cdc---wepofonibe.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a55mo74ikgv9rfhfmc82e41107/rigejufile.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/onmkfma6js2rtr7tng17an2hd0/ridadumemokinajakomelefa.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3aad9c4dc---buponitatowulal.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/tpunvthc7rb018bu2d7hs1jv78/bukamimaka.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2f06f0a21bba1eaba9e9bb34c03cd16/xumipivabazaxate.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/jovegin.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7688d4b2cd84bca0dc50a2be8cbe84d1/48730640424.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c49ea04ad8d---23236778701.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6nfqqv75h5bc6gqlbqkmtevan2/77500577064.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 18224 bytes
SHA-256: 3d594bf1e61f9fad2b190b584a4c534a6ad9f08ff11ed6c2c9d5dc3d1f8b29de
font_01_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 10556 bytes
SHA-256: 5464d58b4bab8708268c55783981e2d7c47f53eb301454cc6932f441595f6401
font_02_sfnt_off00012b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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