Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed20b8cb5f444ee6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 00:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b851837bf7f1b946276e2e63a55ae5aa SHA-1: b45f0ab4729d7e10ab0a0c546b4f7e1bae177d40 SHA-256: ed20b8cb5f444ee6d77dca7a66b372ea532c2d14d178d370f138c244bb717f2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://inwebjor.ru/uplcv?utm_term=6.0+account+apk
    • http://royalwedding.jp/images/blog/file/67383719742.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614087789769f---duleketibowigumenir.pdf
    • https://drlalashow.com/php/billboard/uploads/file/govavuxonozepujunub.pdf
    • http://artpolinakuzina.ru/pict/file/fobewotike.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/5608109769.pdf
    • https://bawauang.com/contents/files/90107829983.pdf
    • https://u15.ch/ckfinder/userfiles/files/63772229641.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/vtojv8cmfj40toab2mvpoj3801/pefavavelasewej.pdf
    • http://selfmadefilms.nl/userfiles/files/24607602749.pdf
    • http://salman-is.com/userfiles/file/donikelorajefigazoz.pdf
    • http://seoulsquare.com/userfiles/file/73079358115.pdf
    • https://10fci.org/userfiles/file/31558960401.pdf
    • http://www.de.ruben.pl/ckfinder/userfiles/files/butelopubezon.pdf
    • https://bandotrading.it/uploads/file/21671539448.pdf
    • http://faceconnects.com/ci/userfiles/files/87049098212.pdf
    • http://flirdining.com/uploads/files/13227189855.pdf
    • https://tvsporedi.si/vsebina/fodosigulajorudojeb.pdf
    • https://zzhqhi.com/d/files/67356945120.pdf
    • http://timnhanhonline.com/upload/files/jefekutan.pdf
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/56180151596.pdf
    • https://torbay.ru/images/uploads/file/nejuwuw.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/rumigilerixukaf.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161425154548e1---jepoxesaro.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c0aac34242e9fcfb4cff5adde9676bb2/tovozovajubesugigeros.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dff23be4d70d00d0f78ce7f2e7bc88a6/puvesixafomew.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/gugukipimafuwedejovedo.pdf
    • http://360global.ca/userfiles/file/wojiwuran.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ae.bin
25a6b099e3e52a0dcd965c84e5c5a18b80653e9ea57df2ec6a37cd58f71877ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 16760 bytes
font_01_sfnt_off0000de79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 16792 bytes
font_02_sfnt_off0000f690.bin
ca15e3087f81dd7c34afd62c00aa4583323f6c5b4b8b8d0bf36209f6cd051e37
pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 10280 bytes