Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cb86b3c004d8c1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 17:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b58d8318c0582b7b63d6d96c343b0838 SHA-1: a70278ab36bf49ff384007d79b844a062a81cc6e SHA-256: 00cb86b3c004d8c1b3d2cba8859193c2ec747d9827626cdd1951e7899913f6f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://archism.ru/uplcv?utm_term=photo+finish+mod+apk PDF link annotation
    • https://doitoutdoorz.com/file/Kecq4O746mYf7H5O.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/47733520498.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/53549489931.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/190c7b880de1c39c79ec6d1013e075d5/75912172919.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9da54ade8---tikapozufofika.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/18908855460.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/vexuvezabefakites.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8dd86efe---2904371166.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/63082008539.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/86246320218.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/jegenuxenasowofafowo.pdfIn PDF document text
    • https://jagominum.com/contents/files/6872164129.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/37686128098.pdfIn PDF document text
    • https://dcimx.com/files/52630421385.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/86451395678.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/lilazidivadomageben.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/12e4ae0625c1acf340f00db607e05464/tutumigideniwi.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/rixazofofi.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/54679961249.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/wirajufoj.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kasapuxanolasujizujeju.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/jagisozawamowekurewo.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_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 10576 bytes
SHA-256: c4424205b62babbec30a240438072a6542992eb16eafbdabd0d8fd80aedbd58e
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 18252 bytes
SHA-256: 920a8023085d1039dd86abb5c977b289a2f662e3ca3b20e8236ae205bc1b0e9e
font_02_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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