Malicious PDF — malware analysis report

Static analysis result for SHA-256 998d68b27e0304f7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 15:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d692f6e4fabbfc99da6cde70c32a7c79 SHA-1: 77e4f2b9559439b8f616592ba5402febbc9c2ba8 SHA-256: 998d68b27e0304f7578c0cb1b9a3a2291222f72eaa44ec397fa7da29a61ea236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=redresseur+double+alternance+pdf PDF link annotation
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8639fd5c20fa2bf12153727778c93fac/6581729625.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a282617031---denutobatorefigimamisoged.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/kegiwu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1fba4645---51055178647.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/98034916521.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/bokujeguwagutusidili.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e4d45e35---mamozosageginabepipap.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-10/images/files/gimatawuwadopupagebutunu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff0bad05c---mulipepujovugofugufijabu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609417968e131---35330962185.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/wuwotasotuwufalelimakuwa.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/87941713375.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/serofujogo.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/xikuxevoligudonidabuguda.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e24iek223lvv6a5gqqg81d5fu7/lijefulalimanimojimawo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a2348692---59410187792.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/xesovorijowurojug.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/murilixur.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nni68qic1g5t7nl6q57d07qu29/demixajunisetedewifupe.pdfIn PDF document text
    • http://dogable.de/userfiles/file/bimavedoxaso.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b28cb65bc7cda1ce819bae1f087c6c6b/7486295967.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/nusogegejizezoleganoj.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/60202356113.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/18045689669.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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 18876 bytes
SHA-256: acb40e3c426ff93d689c8aa8be3eafa2564a6d836c98161bc08d073bd21fb718
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 10804 bytes
SHA-256: 2f02fe5a4ec466490ac5fc812f5f37b579cd4e8b09107ae2227ce5b0a1130366
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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