Malicious PDF — malware analysis report

Static analysis result for SHA-256 325e6e5d22b8e349…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 14:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae7e2dbf0a5c498b2d08f7c519359604 SHA-1: 199f5a9f5ae33f2fa20af3b139ee83b42bf968cf SHA-256: 325e6e5d22b8e349875efbbab27fcb702a71fc5a599b2de8a06e0d33e6b80d9c
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one that impersonates Microsoft and directs users to a suspicious domain. Heuristics indicate a brand-impersonation credential phishing lure and that the PDF is part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://garglob.ru/uplcv?utm_term=windows+live+mail+mac.
  • 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://garglob.ru/uplcv?utm_term=windows+live+mail+mac PDF link annotation
    • http://mc-opony.pl/files/file/69259769750.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/welifipaw.pdfIn PDF document text
    • https://5udua.com/contents/files/luximewenasajasuz.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/84525889098.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210901_161559.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/6v22ip4so657fd2oknlkb1tgi6/pogugilinudekitumonedo.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/xiripejupasekafebowevikap.pdfIn PDF document text
    • https://grouptm2.com/contents/files/wodipodamurigep.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/6110282336.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/21826479390.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6b9b0918---menudilaken.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc22985fad---bikifoviwugowamukiz.pdfIn PDF document text
    • https://buyafranchise.org/files/files/51804819535.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da4d0aa4b---25268417060.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/pewaseparobanuredal.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/rapipewapofor.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/20357263710.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/gesovutexanet.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/22325210792.pdfIn PDF document text
    • http://clickvay.com/upload/files/96228314301.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/ximukakudexadoxutom.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/88540507532.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_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 17244 bytes
SHA-256: a99f48a85b35b1bfd1ed2543e1709755cee76c28597705a8a5f33bc4e99d077c
font_01_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 10476 bytes
SHA-256: cadf2ddc0593f4275ebce6c160170c60b335facf77850a11655f2c92814e36aa

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