Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01c5999bb59d07e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-22 13:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e65decff00a970d94bb5e37d377c87bb SHA-1: 0111bd6b1a4c7dd1dadb54245dd8360d09919c0f SHA-256: f01c5999bb59d07ec642e94af5befaa28f1162c28a63af62e840f49eb96faf71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded JavaScript and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/68fm13tt9inpm79sog8aqf8dkq/34454543842.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/tigedazed.pdf
    • https://healthtecindia.com/userfiles/file/34281476132.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hu3dbbp5jsvik8rq7l9jjhko3m/38032306528.pdf
    • http://dsacare.com/admin/uploads/file/mutalapukafeferojulusi.pdf
    • http://cestovni-postylka.eu/userfiles/file/wirusamu.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/nagotebodabixarigavisode.pdf
    • http://bordahusfeldolgozo.hu/editor_up/tevilupesuresisijisi.pdf
    • https://dcmheavyequipment.com/admin/images/file/fenufuwepuxosu.pdf
    • https://latgalesamatnieki.lv/files/file/82850923120.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/10701494657.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2b2c2f05---muvajifosiro.pdf
    • https://irrisyst.eu/files/file/53039113496.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/637924e7b7688069b7fdcb2ec1ffeacd/89585496727.pdf
    • http://skmsm.com/userData/board/file/sujebosuragiz.pdf
    • https://trongtrucsolution.com/uploads/files/xolejagidagakugisiwakura.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d40e02add---64907289826.pdf
    • https://borgopitti.it/userfiles/file/dalam.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140103c7c3f7---porokuwoxefapusafoz.pdf
    • http://balogmihaly.hu/UserFiles/file/56124131638.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e351bb8eea---38342123033.pdf
    • http://gaishachuukobuhin.com/js/upload/files/39480764066.pdf
    • http://frchem.cn/upload/files/vazumuxuzulab.pdf
    • http://muasamhangmy.com/ckfinder/userfiles/files/dujaxotebotobobupir.pdf
    • http://stroi-sistema.ru/img/28027132211.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+cars+2+for+ppsspp
    • 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_off0000eb50.bin
a418b8cee8db0f7f99784c744c1c0837c61051f1f246391019e1f5178209e09d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10496 bytes
font_01_sfnt_off0001036d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 16792 bytes
font_02_sfnt_off00011b7f.bin
581fe6f4c229ae537dfffeb296d601a40a44637cf31daa97507dec1c33f0774b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 17864 bytes