Malicious PDF — malware analysis report

Static analysis result for SHA-256 80af82ae41a88b01…

MALICIOUS

PDF

88.7 KB Created: 2021-09-12 07:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4162fee64d811dffebba2d76c3637e4c SHA-1: d0fc977137159b88b6c275fcee778d74ae1586bf SHA-256: 80af82ae41a88b01f7ffb977b98dbff243b47a0711dbc7c3e6396bb1a0b00807
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple external URIs and a link farm heuristic confirms the document's primary function is to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=watch+something+new+movie+online+free PDF link annotation
    • http://logistra.fr/ressource/site-image/files/14885474829.pdfIn PDF document text
    • http://webbuilders.com/files/file/xebaz.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/wogupo.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/78525460697.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/larawitikelokoxi.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/88d3d98433d5cf2a06b5d804df67ada5/19089866579.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/gonul.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/jarikanaponiluvudetajo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb8d329bf---kawivani.pdfIn PDF document text
    • http://dsraxys.com/uploads/wopokezadinonodonaferukup.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b95edbcd---26610662746.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/64305843803.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/jepujunarolupufu.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/4564495509.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/zuzokoroteropodojox.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/5410094459.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/61285090501.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/98370500855.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/falikowebupipudoforu.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/70093632899.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbc8f3b64---japusapopitinisajapul.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/82872436822.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pubelemadexojunabodajaz.pdfIn PDF document text
    • http://teifsepahan.com/files/file/24788445738.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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 10928 bytes
SHA-256: 4792a86c415e0ac40cdbbdd926beb6a618727174c21bc49dc1d3e3f2b02603b8
font_01_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 18196 bytes
SHA-256: 3dee612560583038e7a8f4018f77b8c077a5b385443313ddbc575c9a712f7bdc
font_02_sfnt_off00013d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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