Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8899d327b7406d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 08:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77fc4728c3d551c6d646d13a554de999 SHA-1: 406d9d012a10745bffcf69dfba41721006b24985 SHA-256: bc8899d327b7406d2b240ef116f7c8d4965170d4d006609bd9437df384a15fcf
196 Risk Score

Malware Insights

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

The file is a PDF that employs social engineering by luring the user to install a browser extension or update, a common tactic for credential theft or malware delivery. It contains numerous links to external sites, some hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://coretry.ru/uplcv?utm_term=chrome+webview+apk PDF link annotation
    • http://zhfangyuan.com/uploadfiles/files/silekuvo.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/38387531477.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/muvagejuporirikekuv.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210907185804.pdfIn PDF document text
    • https://kapefashion.com/files/files/30259200701.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vagizubugi.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/62990473835.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/13698343458.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7f138daf---98737962043.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130288c33ac6---44939333142.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/dulaxo.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/73854930618.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/lejamukijar.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/20447036920.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21e1ed471---32912369271.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/kofigesebozojub.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/vixepokoribegidolesuzitel.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/nitofoleboxi.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/rivikabarubomopivirifapir.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/88870224240.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/58520619850.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d589e8a0517d8f0677628ce9d5eafa14/35482974286.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/bupowamapalidapexokoru.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/tuxorutevekituf.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/somadezariturajupenepe.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kusafididopekadugetoluwu.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_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 17872 bytes
SHA-256: 4f3f5ba254ba0a5a5d0553af1805af5bec09cbab15cd9ef6dd98f9c6ec9a4f5e
font_02_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 10516 bytes
SHA-256: 1b3b8af7300ce6d7ec74b2054365fea7336d57c0da9dd409843054bc7951a8a5

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