Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cd862d8ffecbb0…

MALICIOUS

PDF

107.2 KB Created: 2021-06-29 20:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0813861ccd86893c9a3440120c3d5ce3 SHA-1: 20081affcecd68668846da938a309b84653db246 SHA-256: c8cd862d8ffecbb0219d6da3f4070ecb2be534ccda394610c0b444a0f48be697
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external websites hosted on potentially compromised or disposable domains. The primary attack pattern involves luring victims to these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • 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.
  • 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://rhodium.vn/uploads/news_file/452931679.pdf
    • http://bocghedanang.com/media/ftp/file/4402540106.pdf
    • http://theclubburger.com/uploads/files/14525098907.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d5103f44bec12c17b74a2b748ca2e63a/41077723681.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761f562ff39---91883287994.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e1f2ed02bafff3ed537539042c0b9bfe/basedap.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/adefcec55e4e6102718e0bda53af545a/pumomimonuvuwiv.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/0jtrcu4cumgfcldueqigvlfa4m/towuwuxokoderefi.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/901bf17632e74c9c0d3c68afe86175b3/2052235714.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacb7c4046---24964768727.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5adfa1e5c4---90696140317.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/856a0bc451328665560143d9722c8a2b/womeferawizatefumupu.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c162f0d1cd0---rupezizej.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f0ebe1ee3---muluzowarojukim.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/29502386513.pdf
    • https://arrayamed.com/userfiles/file/22505390013.pdf
    • https://mimpishio1bet.com/contents//files/kemijemavewopirebuzilune.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7e73cb74---nikopuvixeko.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/75159741159.pdf
    • http://datev.hu/ckfinder/userfiles/files/zomedefawuxepowugupazab.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff12f9f4c5---68269599540.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecbd3498a6---dowigex.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/5582a5b50651ac4df6ff78d4816feb13/zalixijepaxiwidenijobut.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d89a0d5c---66480805941.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c40e6a60b---51732730845.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/v7b3c180sjp1h3m01kmc2fsaiq/78180779495.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=overcoming+physical+barriers+to+communication
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014009.bin
6c9bce7a43d460aec8008806130145e88cb4ff46d8ec50a32035cd0439dc309b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 17100 bytes
font_01_sfnt_off00016cbb.bin
b39517b873ea62a75d8fb2650bfb943248880232c268f68b160a5925532bf1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBB 11264 bytes
font_02_sfnt_off000186d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186D2 16792 bytes

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