Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f04887182564604…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 22:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9202fa8f8ec5759ee65f8902d8fac26e SHA-1: 0404ea39538dd6206c97570e5c456ebde55ee4d9 SHA-256: 1f0488718256460483294ff30de2d6c57b7cecd4004456306cd91f8d540a346a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a significant number of external URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. These elements strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=best+weather+widgets+android+2020 PDF link annotation
    • http://shop-exclusive.cz/userfiles/file/294866042.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/pupibagunifalomedafu.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/muvetularuti.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/67163211730.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/73468629261.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/13937956222.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/gaxesiwijudikasofojodup.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/02aba4a772e2211f2da2a0948c192cd9/87909512201.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/vodibaz.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5aeebf8f2606aac02d0d29dae7edf6ef/berobewuvu.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021092710235371.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b3518c18---40952456751.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091402365370554.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/zeselabedet.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/zunagurosovipurusudenek.pdfIn PDF document text
    • http://rjt1.org/upload/files/nimuxiwanivemeg.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/pegoxinisarelotatus.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/gelidowu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615055c80f19b---kogavubiniduzaperexe.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/43232147109.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/470958c6ea73b900f31a732e37b565b1/fikapuzalunusu.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/pelipodugomorexo.pdfIn PDF document text
    • http://xn--90aatbabxd8ae1kf.xn--p1ai/files/wefaxixu.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_off0000afb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB5 18060 bytes
SHA-256: 28e6ff6e17aac707ab4081e2af73ca6681406e3d953589114e07c4c4aa57a97c
font_01_sfnt_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 10860 bytes
SHA-256: c5688f20071daec0004d179d90e109616ffeb300834cfa269cc323b1c9034490

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