Malicious PDF — malware analysis report

Static analysis result for SHA-256 563a3f9638e8cd8b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 17:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af99fc2960fc29b02a735d93a3769768 SHA-1: 2c0846d469f8bab7f65185ae6870af91f749c98b SHA-256: 563a3f9638e8cd8bb98a2babacae59eb1f62ce392ccfa990724d58d14454282d
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious browser extensions or plugins. The embedded JavaScript likely facilitates this by either directly downloading a payload or redirecting the user to a malicious site. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=alphabet+emoji+copy+and+paste PDF link annotation
    • http://studiotravenzolo.it/userfiles/files/40557004816.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/dejebak.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/n5csne86q54gg03r0hncrthgc1/dejatilesotatemukunu.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/xegapomotorizuxo.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/zujaxusuva.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/fomenepufuzozozat.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/xufetagofilogopenelarak.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/rowovusujume.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/vofotaxiki.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/35380784124.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/tsagvmvf8qagl8mpjffouqb59j/75290724805.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vifigafile.pdfIn PDF document text
    • http://innotack.com/userfiles/file/9311335992.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-13/20210913145418888475.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fuj0k371us3bm4hh0kmnuiaglq/72698122431.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c6ebc2fd---tagenaweri.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/rawakogogo.pdfIn PDF document text
    • https://nyig.com/files/file/detox.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/xebeva.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ebea6bc93---wugaduwokalamub.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/n992mphr0g6ceenerh6segv21h/zasone.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/marape.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/64819638435.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/83536687386.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/tekonoluxoxasagizaropuru.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_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 17128 bytes
SHA-256: 247c39c67b7607f475730703d671b66bcf1deeac847e1dce079ac8f11662d8cf
font_01_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 11044 bytes
SHA-256: 68ea8999fa4016f783a426761d745b0f586f50a0fe440f8de9b16ab6f28d7a82

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