Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a89574b28a212a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-06 03:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0bd263002d66e900d28fd213e512eb9 SHA-1: 90459c4a032af3ce28be4845e11c55c4d4a25e1c SHA-256: b3a89574b28a212a89923fdad17f3f522c1dae763ab749da712dab7532bf6a99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=vortex+diamondback+tactical+6-24x50+manual PDF link annotation
    • http://narcisse.sk/editor_uploads/files/gasuw.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4d4e79ae687a5f0f91997f04625412f7/95336726013.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/72646901082.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/giwofo.pdfIn PDF document text
    • http://dsraxys.com/uploads/pezopukuzu.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/89543564459.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/sojuvutoxapage.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/botorepumujuk.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/78515951317.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/gijuxipulopobomokez.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/45513308161.pdfIn PDF document text
    • http://henca.com/files/details/file/22471370369.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gu37isfh8gsgd4hj0vveh8034o/zinijek.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mn9fld1ug834a59ibqmnume792/52564738437.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/jatojabep.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/50973143520.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/zunitataburubajamefo.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/33902688647.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/belojezixefipap.pdfIn PDF document text
    • http://119pump.net/d/files/82023852821.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9d239d21---84004438125.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jib1hcp1nc3184u3cb3tc5tdh7/tisumumepuzubalap.pdfIn PDF document text
    • https://ka-base.no/images_students/files/90001946672.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bozeduwupesivanumenud.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fb232221d360a3cf62a657a8e09183bc/76284618282.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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 16840 bytes
SHA-256: d2efe277c47e94bae68cef6902bd79cb1f8f507a9076c194575b341e51197646
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 11424 bytes
SHA-256: 14c86ce33377b2c98672b7b7fe685c764094ac61c024c375dfda5e96cb83c396