Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5e590383775d5d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 10:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b992f3378a932d377e1aab3379ee8087 SHA-1: ab0a756ee01d9a47083ec02509e1f844125e2b08 SHA-256: 2d5e590383775d5d1fd9d3d89b4440788faff2f69b338ee3c373105c8bab4e23
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. The primary attack pattern appears to be directing users to potentially malicious content or phishing sites through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bbhshipyard.com/userfiles/file/24007814063.pdf In PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/numonemagutozaza.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/derotifaz.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ac1122272554b6913bb07e94291b515b/36667401634.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3550cf901feb64a2a1fc7e9dab1ebc2b/bosam.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xedexovewi.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/xogonaligen.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1cc638ec7---91208923768.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/gezolakufuwen.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/89174132153.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/3235063365.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p80ntdbf649k3j38kio0vn91h7/34748224864.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/89429344211.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/17287185967.pdfIn PDF document text
    • https://keongracun.org/contents//files/83279410476.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7416417d596a9076642231b145318602/4178225441.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/kkte15i4llktjt3ir5e36l94sd/jizonumukenofino.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/10232987693.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc128c9533---72650304945.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/jufewutotifibage.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/mitis.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/dafokoxagozi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2dtkd0iknrndotkfrpaufjbav2/sixib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=overstreet+guide+pdfPDF 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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 10432 bytes
SHA-256: d9acc73b2dd5cc6c73b26022526f541176a3d7d68af3f9c1b986e1b37c11bbd8
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 18436 bytes
SHA-256: 69cdf055ad09d4e1ef7b9802d1630f4729c26cce43640e84385fd282db802d63
font_02_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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