Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f220cd7994e30b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 21:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2073295a30b31e4bee6cb2f9f35c18f8 SHA-1: 7711a0a0740bfd6ed416d071cff8201738280e27 SHA-256: f8f220cd7994e30be3ca16172f5b96829d85347c66c17f7816dc24847e3c526d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised websites and disposable domains, suggesting it's designed to trick users into downloading malware, likely disguised as a game. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=harry+potter+and+the+half+blood+prince+game+download PDF link annotation
    • http://gndpta.eu/news_objects/files/powitoxabubarurujigameju.pdfIn PDF document text
    • http://idroter.org/userfiles/files/56285009972.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325c45e7fbb---19079444413.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/romawumapolax.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/tufowulofexixevixi.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/26971465402.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44b63c461---nejelididewepozetumez.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a08e8077---39369521280.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/62264302381.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/pejesu.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/goxabud.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/20537569751.pdfIn PDF document text
    • https://cakkue.com/contents/files/pevugegixosetun.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210909201055431.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/kitijerisabeluwepeti.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/80926508542.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/jiweduv.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/baxedugavifadidafebus.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/kisadesalovudola.pdfIn PDF document text
    • http://donghotam.com/luutru/files/82229533050.pdfIn PDF document text
    • https://value.ae/userfiles/file/36957852957.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/gujaxusuwud.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109051023149615.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109180949231406.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/vifolipasezeboz.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/9550771007.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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 16788 bytes
SHA-256: b77338971db895aa535e73c4829b3b0cf9830b6d1db6118d30b5e356cded3bfe
font_01_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 11228 bytes
SHA-256: fe0e17201f713777d39d3e98133ec6bbed3aa6298818acf1f986db67b8e4bb14

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