Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f34f2f0ffc5653e…

MALICIOUS

PDF

91.5 KB Created: 2021-09-01 17:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f52f742f448a92ffc05f1e217cc95c10 SHA-1: 407c78fa2f8e5b287d284530ac841eb9cbc9b7a8 SHA-256: 4f34f2f0ffc5653e3e3d8f9e05ac5fe7dcf401a903728d9e3ba99f412ed40519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://oykufestivali.com/ckfinder/userfiles/files/81101079455.pdf In PDF document text
    • https://vsetinrally.cz/userfiles/file/43037428808.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8sra7t5uatrqvobdl3ercsvhq1/24046953305.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/fugefemanujubop.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd1e3185f5---13473205096.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7405eeb75---22151152083.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114780bb16cf---vipugunumel.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e29466ab0fb182c6dc05e344c0c1418f/98574426681.pdfIn PDF document text
    • http://santaclara.com/wysiwygfiles/file/dexarupujukupidezofamen.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/kozem.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sb4adkqevca144s50ial1t12ui/xavuxusemofu.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/morufovexatilagenibu.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/solebi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16110c656e30dd---xizoluxewaxetexilewaf.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/84054632264.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ab23199e091d2b77229efb1bb3207c7/lalujazogagurano.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/341a84d3c37fde715fff070d68236efa/kejekaxepemiwikotujejepi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f26ca2f0b72---32610650160.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fc18e6d30287d560ccc550c234f0551e/70590778507.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/18637865214.pdfIn PDF document text
    • https://everestart.com/images/stories/file/bamazidanub.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/83709952017.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tckoi8e8srd4br5vv8vlffo50f/9099839958.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/30165933795.pdfIn PDF document text
    • https://digireg.li/upload/fufuvugejodu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/58616593473.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/39638871181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=steam+games+unblockedPDF 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_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 10928 bytes
SHA-256: 6228e1c3f42e7df3e948cae776b8e91e95a86f91855aa0f8cc428f9253a3f15a
font_01_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308E 18472 bytes
SHA-256: 8cbae51e4f04603ba0c193df6baa18af6ed34008f80651515b3661ee515a5c54

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