Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee78a196a35a6b31…

MALICIOUS

PDF

78.7 KB Created: 2021-07-02 05:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b793f336e47b2edc5cf6aea89c6e3a37 SHA-1: 445841fe21301e6ea47499ed7a1578110e2a7179 SHA-256: ee78a196a35a6b31901f6265ee1b45c07becba7f72261fcafa56db9a796f63ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=polity+notes+pdf+for+upsc
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dc9ef18d718353b311826e00d06cc11d/63313768304.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16092fb1de8c4a---99727893575.pdf
    • http://stroisvias.ru/userfiles/file/palix.pdf
    • http://botosani.ro/img/uploads/file/kotumiforixagizasojixeno.pdf
    • https://riondene.ch/img/uploads/file/17639689434.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2eac2334a---11860010386.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6aea7bf65283b0d56e2230ac03bffb3b/91339485184.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5f4a9cebb---39940270545.pdf
    • http://chiengthai.com/file_media/file_image/file/49999856890.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf7221971---67064585083.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785a9dcaa93---totufa.pdf
    • http://bellina.pl/userfiles/file/vubewuxuwaloz.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760eacd833f---9900733135.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829b22a5145---rezuvegevasap.pdf
    • http://valeneighbors.com/userimages/perajitez.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/405d09f310b681694569926e94b3f92e/51528690455.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p5uempi08tak59ajo8ke95lqkf/mapovukanolu.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607854bb05136---sejeka.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e7b377aa---dolituxowufab.pdf
    • http://www.cafeinca.com/img/public/contenido/file/85116309443.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/lugosebizowinafab.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160721da7bac91---getizilafizokodazel.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec448bc007---58817065705.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/e68r7j800dq4i7gihngt71lp0u/wagipivezidopagovanuzivo.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_off0000cfa7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 16792 bytes
font_01_sfnt_off0000e7be.bin
460214577ea9891772ff43a154d1324f1ad97e29a8d02bcbea153cda5a159dab
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 10664 bytes
font_02_sfnt_off00010054.bin
d3c3eb144ff58f7ae64570ca6674639d1c874a0127cb9dbc45493df5b26b2d60
pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 17380 bytes