Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d5ce0c9062634d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-28 08:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b40dfa041b7ae4c2c34160b6698744a7 SHA-1: e631f155bffb987facae351643d6c1be92bac886 SHA-256: d6d5ce0c9062634de61532a6e99205854e268b83b2738131375de59cf9a29016
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://nesemlak.com/test/images/uploads/files/jujofu.pdf In PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/81609700349.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/lezetajaluduzewafugososod.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zonikogadubefadolisokulin.pdfIn PDF document text
    • https://xaydungkienthiet.com/upload/files/zuloxajutobegam.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e697272c85e52417434e24ae9dc011f2/wudelurokere.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/5744046921.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/pabuxebekazize.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/62975268521.pdfIn PDF document text
    • https://tekmaker.com/upload/files/bonikevo.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/94567472811.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4f91b18556219f6349c313e68002a23a/30196835857.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/88875661695.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/nirudanivusuvuga.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/tupagoxujobisazel.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/16017089303.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/22336327039.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/towokeniv.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/86278862775.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/tavaj.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16144111074ef4---44367142765.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed362b6a9---28854199311.pdfIn PDF document text
    • http://cripper.de/media/movabe.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210918_52B5C85272D3E093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cara+mengubah+format+foto+di+androidPDF link annotation
    • 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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 17296 bytes
SHA-256: 9f0db9632451d6c176d8e2331f9f7c3b6fcd1b96338abee19db0866132fdc938
font_01_sfnt_off0001118a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 10856 bytes
SHA-256: cfe5178aaeed50f4251f1b5a5f17bc97dc63cd4a8483332fc4d05ba9a4b6f12f