Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7d036e391b851c…

MALICIOUS

PDF

68.6 KB Created: 2021-10-02 13:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 44c60a7eabe20e82aad4c102c829f7a3 SHA-1: 258893178c44b2726fa34756fbf03de7a1b78c95 SHA-256: 6d7d036e391b851c99876ed30eca3189a36387972a6d9bdc3fd733b3e8368eab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these redirects. The embedded JavaScript may be used to further obfuscate the redirection or initiate a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=geography+of+nagaland PDF link annotation
    • http://falconltd.pl/cache/file/16158536022.pdfIn PDF document text
    • https://tigaintan.com/contents/files/95348558122.pdfIn PDF document text
    • https://communitytreasures-co.ravebusiness.com/gbe/useruploads/blogs/files/zodatezarus.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/51182664614.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c48627bd9a---zisexekabuvu.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/55667061140.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/57389777848.pdfIn PDF document text
    • http://elpijisystem.com/file/gefetotitewetakoso.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/masuwuzorimasej.pdfIn PDF document text
    • http://lecostationery.com/files/file/jirivagokubalu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/zilujuruzexegutis.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161479998f1691---kuxevagaliru.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/jajuvexegovito.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/85335982666.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/lukozegadaxuxere.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/weliperopowadatujufovu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd05573793---11831120950.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/16144929699.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbba207c4b---gotomejidofebotopujelida.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zupawinatis.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/dalux.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/2362898870.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/55808307632.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7a79de22f3dbbdc94fac17e1684e69a3/9346021500.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_off0000af81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF81 10572 bytes
SHA-256: c7504fd1ce7f1a17cbba9011af640ad207efd8ddea13661486407a3ed12e05f4
font_01_sfnt_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 15100 bytes
SHA-256: 32685fa3e79b5c636b09bb0aaf6352e64c278cbeef967b37f9a074aa1b51e9d8
font_02_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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