Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffd2cb2367c4fa9…

MALICIOUS

PDF

89.3 KB Created: 2021-08-14 19:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2db677322e906c9adc86cc0bcfa5c64 SHA-1: 0127c154e7105076f7b054653d448d9850465198 SHA-256: 8ffd2cb2367c4fa96cba82f882fa4f301b6a1942693d78918fad5631468622b7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malicious content. The presence of multiple external URIs and the compromised CMS upload link heuristic strongly suggest a malicious intent to exploit user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc344b2998---41203604981.pdf In PDF document text
    • http://pnmanagementsolutions.in/uploads/zurikezotor.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607228e924b82---gegezazipumemupa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5213f289f0dfc91a8a2142e320f714ef/57771655404.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/45296628754.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/penotadekiwa.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d1e0d4e3b471696a686f7974005ab069/xamovelesovosaxivag.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/wewiluvemusobida.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d9bfea6ad53787f0e2416f1a34f2f2db/tojavi.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/18734381288.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/95426126398.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/jubuxomalet.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/71036485169.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/vekumokudagezetibogifunu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946dc85253b---goxidepatorelobezedu.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/34401829891.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9lri6nj3vr8pl643vbqabrikj6/1362118556.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/voxadexojawerowewidi.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/73196674787.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210620_ED0714F87CE2C78D.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/79708471937.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/papuwamufitu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1eecc59608935dead1b8c91ad9643792/30367624315.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/46200254932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+legislation+do+teachers+have+to+followPDF 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_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 17140 bytes
SHA-256: 17b7271bbb512b3050d0ea5656e229cb83b21da9019685652a3806c4293956f9
font_01_sfnt_off0001252f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 10900 bytes
SHA-256: 7356570cd3002f848dd843909fdd1b33ed2e9ce2c0d3e8036fd9e8574fdef5d1

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