Malicious PDF — malware analysis report

Static analysis result for SHA-256 f967ce86cc278ad9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 11:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b83cf0da666f72f44230f29679852f8d SHA-1: 7ffe6b20a31790510c697c63d20a29fd2332f5e7 SHA-256: f967ce86cc278ad991554aeee066aa87d71a66625c33260c058b62d76d6bf7fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://vhshf.de/File/36269310797.pdf In PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210907_1C8D518A79A6AE4E.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0c77509b559ae838f8392f4ccb4fd26c/nijiw.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/65007082211.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/sexazajixulirixetosifizo.pdfIn PDF document text
    • http://trubaopt.ru/content/file/magolizudobalukagozo.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/gasukafuduti.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/22240976625.pdfIn PDF document text
    • https://camphacement.vn/upload/files/sixularorewikosukigutozu.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/8538408762.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/rotete.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a84c45230---90452889909.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/vuturelozupepavujedurox.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/64486862909.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5b74580105ffbac02fda4683eb08d25/zukufulifesulu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/57dd85a60f4d172cdf3514faba43d50e/59315934212.pdfIn PDF document text
    • http://newo.ru/files/files/revunez.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/dosojolubigudobetanivawo.pdfIn PDF document text
    • http://santabruna.cl/upload/file/76579895411.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b2948b6ba3e3f2da59743c8da29d3249/14617126452.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/gawikinomerosozimugar.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16137944c73d4a---sevigata.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d2f531b2---pujaki.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/tufonu.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/40216745851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+system+update+notification+won+t+go+awayPDF 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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 11200 bytes
SHA-256: ea1a0f58277e33b758d67e4ccd898f3421f2fd373fbbf2f23ca4befe559adc4c
font_01_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 19008 bytes
SHA-256: 0e6d88e804b6dd86090db2f6b0ad20a2f60b98d0875f2450dde5fa32471f41c0
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1