Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f4a6adcaa5da3d…

MALICIOUS

PDF

92.4 KB Created: 2021-09-17 02:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc3a174db47dbef5038582b28eeb49cc SHA-1: 1bf7ed76ff208243607618d891a6a7375dc6ef6a SHA-256: 05f4a6adcaa5da3d999deb352734f6eb6888485931be54abf507aa59a4e13792
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic findings clearly point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://huntic.ru/uplcv?utm_term=pinoy+movies+site PDF link annotation
    • https://studybrilliant.online/app/webroot/img/userfiles/file/potizope.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140789b52db5---rodakotivoxiwutoxatuzagok.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gowifujejuvus.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/firusim.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/kogonotovamulezuzituvugu.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/36926574689.pdfIn PDF document text
    • http://secretinvitation.net/images/files/mitenuwuwoliwol.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d071a9ee---10725874032.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/xabagavarosizumeja.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/30896668438.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/76e902f9621f5d7199b905ab1cc7a8a5/kiwiwijezitekitelasix.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/3645764685.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/29771692e0c514f47e61900475cc56d1/51407242811.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/87729781348.pdfIn PDF document text
    • https://blugarden.eu/file/85277609211.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb651245bb---xapibiwuvademagosozux.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/bixoxetisaf.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/41393116611.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/42101147203.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/60115586752.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/31579979083.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142647064960---xuwidigukaxikokulezid.pdfIn PDF document text
    • http://shahgrp.com/uploads/kajavujexepapudegaled.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/10804226001.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc950325b24841cdf800504784123938/mugejewaferoles.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/lurosunizozezi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 10144 bytes
SHA-256: 89ca5146852ff57bdd30e48a2ce9512422a84a7ecafb2f13a249ef7081429e08
font_01_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 17228 bytes
SHA-256: d327afab8895d4a7586f101085584881158825823ec2c53c46d3e2aa4e0782eb
font_02_sfnt_off00014bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1