Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1e2fe1c0295195…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 04:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de6e44a500bdd8861ee5e525a330c847 SHA-1: 4da3457e9db194230c0546595e8b56ee9c21df49 SHA-256: 8e1e2fe1c0295195824579519dcef44dea05663ae427ca798ee2e9941cb71c56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress sites, 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 these compromised sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ogm59ji2eqd4kdgch6kaf70fdd/wegaf.pdf In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161444d09e5b27---kawejulilupakaroguled.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/finebiluloposurakes.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/65351111384.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/navovaparoriwirivipiwuwo.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210910_5D0383625CAEB598.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/37c357ef9ee3b45da52a911a3a4fd0f8/42033950582.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/neridafofafowazipidusisus.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614038b52bd65---80181420628.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/25182382241.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-1/20210901171007484731.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/sigobudi.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/11602545464.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/lesupebiberujigof.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/vidofuxujavisudif.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c2644d81---33183028819.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/1310422386.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/77060586998.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/kutikupawixi.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/dasilobitemulemek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=8bp+coin+masterPDF 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_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 18284 bytes
SHA-256: c500b3350b91bd2ee1516ed40d37213d5fb95a63813c7825cfd622dea9a55b38
font_01_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 10740 bytes
SHA-256: 8e9b857b1afb8a5d53d6d184f77edb6166a6917aef01e64e99276a649e144e14
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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