Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f98b266ae06c90…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 06:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1191f7bbbe304d19224680ac514e15b2 SHA-1: ceaa2987e68d42036f2d651dba62d1d7ba331671 SHA-256: 43f98b266ae06c9041de4af128151a9a80c9eb9b33217d74d2ee5b709e65d57d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and links to compromised CMS upload storage, suggesting it is part of a phishing campaign or a distribution point for further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=ease+diverticulitis+pain PDF link annotation
    • http://ctyrkolky-gamax.cz/data/dokumenty/niwawasa.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/47446206844.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/15832618241.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/22905990916.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8997e3815ba38efc72244e0ba614d6a9/21442055238.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/113e38c6271dc8e1d2e9d92837057d5c/18938309642.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/judesufawatiw.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/repunupex.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e4551ed41---81656140532.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/0400ff0bee9faedbafe042d181556ccc/korol.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/8109558572.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3d8accd30bfe7b97e70b333bfefe4095/12622332668.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/6686578267.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/63140523740.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fd662350db7---12949420920.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/18479337162.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/kijef.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/bibegidukixi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/a9d5sm7rp0erjno9cecn4i66f1/ragigisonulewuduwabi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e9827761c040ba98f0140949079c0d3/54513420548.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/pemujufativaxuvulav.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a117a5a87f---45410768491.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37ae2ecc8---70812549960.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/862c6af982ed8d10b14dca74fbc996c2/76589810443.pdfIn PDF document text
    • http://checopharma.com/upload/files/32224311025.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_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 10536 bytes
SHA-256: 0a50eaa31723dee12c8b797e92202a6f4c31ec750e600db7448141de0a42ff04
font_01_sfnt_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 15196 bytes
SHA-256: 1dd05bd862938d4f1e21ad85f764a68f09e7ab399174ae03771af8dcdec883d9
font_02_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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