Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf11e27668229d8…

MALICIOUS

PDF

94.8 KB Created: 2021-08-13 18:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b7ef24529a8c83a7a96ea049f5463be SHA-1: c7bdf40c80bae2a2cafa8962c5db0b02c4a9c9a9 SHA-256: 3cf11e27668229d8c0284611ade1ecc81097adcf3818cb17cd3594dd80a30c69
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://oniceh.ru/uplcv?utm_term=adobe+photoshop+cs2+keygen+online PDF link annotation
    • https://topupdana.com/contents//files/fubefasako.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608370fb132a3---97180211910.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161100c033c614---depufikosuluguwibibukuz.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/36073286934.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/kttnmemnu26vvk7mq4foeks91m/zofoxitapexunozevaz.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/mosazis.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/finodimalat.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f24af54f---59111866050.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/48469159655.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/jidesoj.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/14125530116.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/poluratosirirere.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0a7dd8tsf1ahiqgkem9mt5l6oi/fejixijoruju.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/mitapogov.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eacb8459cf---sukalo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ddc66ce038d40e11d365dcd15d637c26/jofojafumifago.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/lakaleber.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/30965692730.pdfIn PDF document text
    • https://s-h.cc/uploads//files/202107301842188980.pdfIn PDF document text
    • http://normel.org/files/upload/file/tuzusilalefidagodesederob.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f9009b92---xapofadasusaja.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/jifinukuz.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/56236260565.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zajidarivajebabari.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wumizodisija.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_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 10976 bytes
SHA-256: 9d3187726dcf003ca5cf9240a65e1cc44a68ccf0d9097142f42e026b47ac8aa1
font_01_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 17520 bytes
SHA-256: e067dd6dff9a55b24bdcaab77a4dc47ae00edd30ece9af860b8ec6fbcf440297
font_02_sfnt_off00015319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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