Malicious PDF — malware analysis report

Static analysis result for SHA-256 3395f9c8c5a8c3fb…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 04:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42f607ec520ee27e0028157f1bfa3ddd SHA-1: 1a7a61cf7daeb8cb6894db8d4eeb7159538b857b SHA-256: 3395f9c8c5a8c3fbcb366267c611e8a1c9674f807e95380de91fc1c955c90c3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://makinsushi.com/uploads/files/87407104840.pdf In PDF document text
    • http://aftckwt.com/uploads/file/wajodaporap.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/xakavatimezudopesamivu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f792e2bd2e2---kajomunabilepo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b0ebf5e844e0ddfe00c85deb3a28f209/26411358671.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2e393de9b375d509334c7c6933cc3191/69724817289.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/wojap.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d4367964ebcd702e05a8561900df86b6/26440753030.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16118fa80c431e---95073244370.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/tuwitigijowekuzipuwujow.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/limobirinipaboxe.pdfIn PDF document text
    • http://darec.sk/files/files/59814592475.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/tigizebovizoguvitu.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/simizumimusexevupu.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/bilawazanokogupuv.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/21538897803.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/34692201337.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/vuzotofepexirekewezib.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/favogudogufurolotagogizu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608793d0ada87---tarixipezeluwiwijirad.pdfIn PDF document text
    • http://iphysiology.ru/upload/40742399576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=data+flow+diagram+tutorial+for+beginner+pdfPDF 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_off0000bea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 11000 bytes
SHA-256: 007591b6fcfe1343c27ada8abc54a027c6498e6d3df1e3884d84d094b144b50d
font_02_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 16820 bytes
SHA-256: 694ded9f8f5f1f7f3c6b8f76e6f2873f70fe2710744fcec71dbf15564a6cfedd

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