Malicious PDF — malware analysis report

Static analysis result for SHA-256 397a7154e23d093a…

MALICIOUS

PDF

84.2 KB Created: 2021-08-20 20:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bd0ea6cbdbf4a3bc95d4b391827e8ee SHA-1: c102aa28aedcc94651cb23eade04e6a9e6f3f963 SHA-256: 397a7154e23d093a11311e45866773332e00d2ee245e17cc066d818249594710
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=connect+yahoo+email+to+outlook+2016
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/43115464065.pdf
    • http://duszek-lasu.pl/userfiles/file/fidon.pdf
    • http://jhferry.com/data/fckeditor/file///nobisemolalopinaxilu.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fig77ua3b5i34mq7fn99bsc8t2/jukagekibakaju.pdf
    • http://baigeleather.com/userfiles/file/68644119693.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/duguzavutuvuwotu.pdf
    • http://tivatijapan.com/uploads/userfiles/file/guzadejudodij.pdf
    • http://www.allatpatikapecs.hu/images/file/11951723252.pdf
    • http://alkanboya.com/files/file///59908063027.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160941521ba10f---87139241382.pdf
    • https://festival.bg/fckeditorfiles/file/27977573814.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/51dd54e81e61df713227d898bf0bf702/64780266813.pdf
    • https://kund-in.com/userfiles/file/fabiselunaregafulunadav.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/75088ceb52a9ae5ca60e93e4ca48a84a/25287203420.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a2a4f4602b12dee1539564d0bc407381/nujitolunafakatewa.pdf
    • http://studiotecnicodavico.eu/userfiles/files/19110385985.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87d407512---bidogu.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/61179e9ee1d38c8085c3f462d6cf52bc/44083796457.pdf
    • https://suavitinhtannha.net/upload/files/9778558307.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a6d533516b03d3dcd9369632bb0db2c9/46185045047.pdf
    • https://maconlux.lu/userfiles/files/75088613834.pdf
    • http://geologicatoscana.eu/userfiles/files/famuziduge.pdf
    • http://turnwealthy.com/ckfinder/userfiles/files/80462951049.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b592552e852---63987483361.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e97769e3a---83080186693.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/51add9d9425da920cf3be5e7a558f076/34421204780.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_off0000e290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 16792 bytes
font_01_sfnt_off0000faa7.bin
35e1e80ca4a68f41418d9a1ebd046c2309f14bbed97621fe6981cd07d2d4ee33
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 11028 bytes
font_02_sfnt_off00011433.bin
dc8356595497c1c497dc38fee79ffc6e3201aa1d457b154f305ea024ab96831f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 17232 bytes