Malicious PDF — malware analysis report

Static analysis result for SHA-256 414920f49315cee5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 10:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 245a8bdda4e1fb78843528fb50a23891 SHA-1: 03ade417f414e5092ba1050a6b8ec0891823290f SHA-256: 414920f49315cee529d5868d3b1c3ae2ec4d7dee2c521cf6a47175a3d9f6a9ca
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=free+screen+mirroring+android+to+pc
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/3656527501.pdf
    • http://uk-finansist.ru/userfiles/file/wizalov.pdf
    • https://tiguan-wiki.ru/file/59459388506.pdf
    • http://phutungvespaco.com/luutru/files/fefexexokofir.pdf
    • https://rent-1.es/ckfinder/userfiles/files/49730272649.pdf
    • http://ky-auto.com/uploadfile/files/dutidizafujudekurotobuz.pdf
    • https://hbfilm.ca/resimler/files/74354389116.pdf
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/pebexarela.pdf
    • http://sattosushi.com/uploads/files/juzetebesorisitaxivoseva.pdf
    • http://test-immo.com/file/zarevekinofatokekupu.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d48db006---vakulugonizasitaki.pdf
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/13824145126.pdf
    • https://bonvoyageindia.in/ckfinder/userfiles/files/masenekurujafadubi.pdf
    • http://studiotecnicopinto.it/userfiles/files/6971019474.pdf
    • http://didaconcept.com/admin/fckeditor/file/9317657717.pdf
    • https://laptopserwis.com/app/webroot/media/files/34200960525.pdf
    • https://divinenine.net/userfiles/file/tivasibopiki.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f087cc0a46---78680067380.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/d1qfj9q2vp4krlftu3hq5si2q0/defanekonapawuzawufifut.pdf
    • http://ttlh.vn/storage/ckfinder/files/lubifununukukutoloju.pdf
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/50133080923.pdf
    • http://saraiaser.nl/userfiles/file/40951418502.pdf
    • https://mtydizayn.com/userfiles/file/85529923666.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e60b646a---76012891996.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3a925121---juloraral.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_off0000dccc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 16792 bytes
font_01_sfnt_off0000f4e3.bin
3718d93cd37a4b74a1be70c79f4e1bf598c513e59f542dc51b57039a4c772f87
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 10788 bytes
font_02_sfnt_off00010d84.bin
739fc188413905cefba9d0bd8031e6c970def53aba073cfbaa8cd2fe63478c78
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 18148 bytes