Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4e48ae5d46a6e9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 11:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c846ed0692ec4fa5d3d780753fcdf266 SHA-1: 4aaf364e565869a8e772bccfdd7b7450321de3e0 SHA-256: 8b4e48ae5d46a6e93fd9a9abb5d5ad66e0ac2e8015425a9bcd05e50b2a6457b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://rem-stroymont.ru/img/file/wekunumifaforetur.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409279c7a78---sinarimixukadalebeg.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/58972171361.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/54878615253.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nuveketi.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/dudufezisise.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/851509875.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/merozozuwisewabotobez.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/gitenopumizisikop.pdfIn PDF document text
    • http://mobiliteit.nu/files/malugoramerudipaduwuruv.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/56125903007.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/90593793191.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/wigawepudoselazesedowi.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/89373365132.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631953983.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fe80c5a79aab4c193b18432c4702c49c/411179321.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/jisabufugofunak.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142f61d22c20---75443397361.pdfIn PDF document text
    • http://freetds.net/userfiles/file/nutigome.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4668b550c---fomokaradalagom.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/ramivezu.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/21652349623.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108312349318588.pdfIn PDF document text
    • http://koutingchina.com/upload/files/lumaba.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/68093926793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=nba+2k20+app+download+freePDF 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_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 17620 bytes
SHA-256: 43f3d2639eb909f9e8cf748f4afa54124f354094d648b9304b46c5051a5709df
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 10668 bytes
SHA-256: 005d1e22df47b89a538de78928e9193695a8ef38da768bc21bbca3eb494d5032

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