Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa5e19d29a98b12…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 11:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 07ccf7ebc99b20acd2f47318cbe8b7b5 SHA-1: 1eed022f013871cd635bb5ce1733d47862ee7cc2 SHA-256: 6aa5e19d29a98b12057d208c61a93eb083267ad12746a6f2240f20e782d79dd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy domains. The embedded JavaScript and the nature of the links suggest an attempt to redirect users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=how+to+improve+my+phone+performance PDF link annotation
    • http://honderhotel.com/UploadFiles/FCKeditor/20210914095245.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/5148967713.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/73178165526.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210907_6F6B95E7F8C25C24.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/87032721779.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/rufawafa.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/ginokuvawaz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8558939e---58905157359.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/sojivivadel.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xarukoporuramijobeber.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18f9afe74---lotexufaz.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/33738387924.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3564d38c2322414e96eb32ed93ed05f9/35509551953.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/nigibofezi.pdfIn PDF document text
    • http://gardatrans.com/content/Files/88822649996.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/8809451967.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6a070aa1b---74268887992.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/29bdd57db4b398aba0e7b45160ad0017/22924490862.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/23756218459.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/golutasivaka.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/91383284487.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/tepapovanifafega.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/xanemizuzoxapurukolejigus.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_off0000b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 15572 bytes
SHA-256: ae8eb99768b7def03422e21d9b4f8c9a3d8393a56329412fb7e35d845d97c47b
font_01_sfnt_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 10788 bytes
SHA-256: 7f2aceb0474944fe3ae8f3b35f77f3107744720c64f88d85e3218f9b15cce074
font_02_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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