Malicious PDF — malware analysis report

Static analysis result for SHA-256 6890cc484ec8dc28…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 10:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: acb457b677cba05935e66b3e154ea096 SHA-1: 4062e991242b9ad10e0cdbba7a9be1456f6f6454 SHA-256: 6890cc484ec8dc28e74e5187c4ee9ca0c3b0005256a3de641a290bfe5c732e1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://inannamsao.com/uploads/files/3791889865.pdf In PDF document text
    • http://onlineticketreview.com/images/file/6416701183.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210923033400.pdfIn PDF document text
    • http://flexa.cz/docs/file/24266126614.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/fodas.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a50690a0---nobexelotewukubi.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/72181471652.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/499741797.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/3372131995.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159d54c03308---nejofejid.pdfIn PDF document text
    • http://dsfly.com/uploads/files/907100467.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/72350161366.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/pusoge.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/bibegevulomufejifawu.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/pamavomopomelu.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/21424164270.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/tenanar.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/pogukulefesanebavig.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/73189780312.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0fe1698a3b7955af8132548d11d9fdb4/74647806598.pdfIn PDF document text
    • https://www.de5dollarsdigitizing.com/ckeditor-ckfinder-integration/uploads/files/digaluseg.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kujixujabesameros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=last+word+quest+guidePDF 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_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 15544 bytes
SHA-256: e80277c86441b78119bd3a1bb5a801857161f8010ff783c7993d4b1380c51c6d
font_01_sfnt_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 10560 bytes
SHA-256: 96654c873381360332ac75bcb9a7ce0db5bb9fdf176c9c5ec29717af94b7b8d3
font_02_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1