Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3582ba5b693547…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 16:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be7fd73409c127e62ccfa54d9b9430c0 SHA-1: 5e65199770f6bb9df0b47508a86490e65efaac27 SHA-256: ca3582ba5b693547cebf84c968d898b40d03c98b684b6477e2c5d7b29e9135ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of using compromised sites to host or link to malicious files. The embedded JavaScript likely facilitates the download or execution of further malicious content, contributing to a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=tsc+appraisal+form+download+pdf PDF link annotation
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/79663366710.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/94787085070.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160712a6c13137---kunir.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/695763757.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/burujo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d8c6af7ba---patotowa.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/defofozag.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nuvukedizavopuzegosilo.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/fazolaputis.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc8549167---5850374043.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/58496510846.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/kipepifofowiwivopanobin.pdfIn PDF document text
    • https://cakkue.com/contents/files/39891369177.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129c33d90dc5---57400763047.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/zupumosejimisuka.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/24721429785.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/zuzoxinodowir.pdfIn PDF document text
    • http://signauction.net/userfiles/file/39780948035.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/tixoxenuzafegunub.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/96ff6c63d3e9a218056b530ec6ff0b1e/9908086907.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7c2c97daf72c1205cf20c779dafda67f/33332357894.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/11300735864.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/q8te1cs2c86k5vksoqibbm51ff/mamitumatub.pdfIn PDF document text
    • https://loctra.net/userfiles/file/39073371968.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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 10600 bytes
SHA-256: a04b4d93efda8d803a24651e50db8cde001d1b97c697e22bf6ee54e319ef5e8c
font_02_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 17248 bytes
SHA-256: 6d5dabd90a05c6ede5b9fb8b3c316975b122cb239bd23cf67b9cde8359aaa00a

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