Malicious PDF — malware analysis report

Static analysis result for SHA-256 9855ce4c6be8e5c8…

MALICIOUS

PDF

77.5 KB Created: 2021-09-10 16:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35b0cbbfbfbae9694f79c7642d0b9f75 SHA-1: 620075de7841f6cb87492e5d0ec8ca0c58dfd07d SHA-256: 9855ce4c6be8e5c8d23e1e21f43fcfd91e5a6cf498a3cb968eb3ab1784a23651
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external URLs, including those hosted on compromised CMS platforms, strongly suggests a malicious intent. The ML classifier and ClamAV detection further corroborate this, indicating the PDF is likely a phishing lure or a downloader for further malicious payloads. The embedded JavaScript is likely responsible for initiating the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=dream+league+19+unlimited+coins PDF link annotation
    • https://krainaogrodow.eu/zdjecia/fck/file/14872965633.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zajedikisamemogufenimiw.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/xenuzuneloxul.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/fesavabadotixov.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/fb504fc4eb72a1b59bb429b229636a77/38226758548.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/38009218469.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/mepasiwitoveki.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/gajisomonexuxokomorovi.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/bipigajoni.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/rozulozepujomivubi.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/86450366405.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/13678036431.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/lazarajuxafukifutopuko.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/duduvigazesexo.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/wavulewomifov.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/firetivid.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/14955138954.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613248592c91b---98947043090.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/supubilujikop.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/23549429554.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/90657937304.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/pavuvokusikusebus.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/uadic2mnd6bu31m1kgs4iba6l0/nojun.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/novodozunajiwi.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/51523523729.pdfIn PDF document text
    • 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_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 11032 bytes
SHA-256: e15c55ccbb215e265fde773a750bd61a05f02931bf66f2e1221544c7669d8077
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 17704 bytes
SHA-256: 83ae21dee64720b99e301555308b233f9f3fac99526bb6248a117946c81e5354
font_02_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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