Malicious PDF — malware analysis report

Static analysis result for SHA-256 818a448c9d9084cc…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 21:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3132c42123b7e5d77063acd42b6c232a SHA-1: 84a1cd93c9eb9439afd72fee04ef7d932c357942 SHA-256: 818a448c9d9084cc0c1c5dca859b89463b101a8aaa6f42583b2a80f6a11ef590
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://tndvn.com/js/ckfinder/userfiles/files/lunepanugoxibo.pdf In PDF document text
    • http://juha.be/_files/file/66260296005.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/11565226400.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/tizodarumataba.pdfIn PDF document text
    • http://cascad-trans.ru/files/23802491734.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613227646676b---82058529783.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/2349583981.pdfIn PDF document text
    • https://brs.jo/userfiles/files/xazaruje.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/netabij.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/29523279515.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/71360118913.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/8843767246.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/taniponujizo.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/kisasazawavifawotisozaza.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/92899530387.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/ketitugejod.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138641d1d188---lixerek.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/bozirovulupixumudelatunos.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c823f024---83984851797.pdfIn PDF document text
    • http://orenprom.com/img/account/file/85689600848.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/jegubanofizufekabafokam.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/43796610830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tekken+mobile+offlinePDF 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_off0000c8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B8 18504 bytes
SHA-256: 724a98551ccbd4c700ab82c66a685cf10e5784216fc492d012ae70d0b467da43
font_01_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 10044 bytes
SHA-256: e51df7c5834c5820a5703ffdcb1402beade7296b30bb357d8d665a7609b056a6
font_02_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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