Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2f021efe4897d7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 06:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e963846eae7df4dfcfb9a5d77b045be5 SHA-1: a060ba2e4a5d634a14ffc9fb721ef01d5c50ca12 SHA-256: aa2f021efe4897d7cc13d0498914918b45537c7f5ab4b657529a206d6167f5a0
164 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of embedded JavaScript indicates a likely intent to download and execute further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://avandcie-energy.fr/ckfinder/userfiles/files/8891921661.pdf In PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/18425925440.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4b88f199cf5572db5691671608ce8da3/rigajatofinemisutigitawil.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/mizaxibuwulonixo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kavuwilukedixakijixe.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/78554885253.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131576253a54---suwumojanexego.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/78181686490.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/93479302239.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/lavinewugupewevimosulil.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/tudegejovetes.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/77376901015.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/badofitidigetifedutulaxor.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/89865512637.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/66226778982.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/30547160284.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/be4b3bb0881c0a5af5b3f7927d60b54c/renilajir.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/lunarivutedekosuvevusuz.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/94888774303.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/remozifenodamok.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/519654429.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c9eab3e0a3ebe7b8a23fc0be2808efb1/87281442542.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/97703741902.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/vawolexezosuvutorov.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rojadavovivumad.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/monuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+app+limit+screen+timePDF 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_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 10656 bytes
SHA-256: af70209b1ae753c9f2e39e203d66173718e0fb7faf96dbd29a721393c6bb606d
font_01_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 17452 bytes
SHA-256: 15729e8b01ab31241d1edea44a5f01133eba45d8d54184f476289c6ee1420f73

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