Malicious PDF — malware analysis report

Static analysis result for SHA-256 e695cb57a32da482…

MALICIOUS

PDF

152.6 KB Created: 2021-07-18 01:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8241420d0760af833bf771c372259441 SHA-1: cf8120495effeaf0e5168a6e9e8215cf7172355e SHA-256: e695cb57a32da4827b386752f8324159f3a55ec9911af314926630097a43c117
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 7

  • 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.
  • 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/58adef22542767ce3bd0704e6f0a674a/19413105503.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73bcc30f81---79078288792.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04f5e1c7a5---67067922781.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/1162288635.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/883ed73c0cf28e7d9d652c5b61dd6fc2/34307497700.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4bbd60a526671bf3e9533eb986e3212c/11083400090.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/dofac21s57ou2mquc5a88mes9r/vugaxag.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0135cbrsqsmhrm74ok60c1tr73/fegesinos.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a35f6835768c1536d385161e300d2f68/rowujuz.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c65c35c9d---64850458133.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48ab1e40b4---17182124065.pdfIn PDF document text
    • https://laps.pl/userfiles/file/tewegolarokurebu.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/67176952465.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/74562377626.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///tawotovuvazisorurarezu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/93978545870.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105140248044803.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea4aacf7a8---ximurexafebipaxolud.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/39682311951.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415be2ce2b---81424360156.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e588963fd8---93901957815.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/jewivefeji.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dd56c645c---53765188415.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5suv275e8qk7r8ji622vf8tin3/pudes.pdfIn PDF document text
    • https://guijek.com/userfiles/file/nitamafamedovemed.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e826c03051---famovuremarubukoru.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/14611711908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=neil+armstrong+elementary+schoolPDF 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_off0001f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F506 10768 bytes
SHA-256: 3c4ab09c421a91d72e6b8cac4f5f55467ee7e0bfe2b71bf5e4f228db827c61f2
font_01_sfnt_off00020da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DA1 17752 bytes
SHA-256: 26de8fb205472d87a1544a1831d297910d44b2e3a4579010110a98370cb8a96b
font_02_sfnt_off00023c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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