Malicious PDF — malware analysis report

Static analysis result for SHA-256 9071485902f66c48…

MALICIOUS

PDF

85.1 KB Created: 2021-08-20 22:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d8ca710c48a228519470f029d74bb08 SHA-1: a96f3d1b893c83e87938e837770e43ec73019b42 SHA-256: 9071485902f66c48dc71646f9fb87cd322de3dfeaa03ee76e8bde883bfa6486c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs lead to various PDF files hosted on potentially compromised or untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://profil-metall.de/content/uploads/file/gibedumuvotugikew.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073856b9baef---83140133221.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/rifisofomexoruzana.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/af70458cb8f67a5b9c83aa4a6d4a6115/gixowitoxugutibapori.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vhg8a272f63jgsvfoh4q8r2ug0/dijoxulavavositefegum.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/53404899138.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/93619854375.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/6102750428.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/f94a94d9a39446d6063e99e893558551/5750606240.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1815cea76e1c5caf48af5c8ed6a002f6/sixubonuxotarenavame.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/22efb0586f34927cba1699e8ad7cbfad/44770537679.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/65977921502.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/pufipozosibolup.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/36841153858.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tjq87o3bb16kifuki1pqlon795/14599203763.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b23273aa84629895ad0e51525f7fc628/rulomo.pdfIn PDF document text
    • http://liyangah.com/Upload/file/sekazuvujoramuvimebuvu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfd7eaa81---kewefuzubofutuwi.pdfIn PDF document text
    • https://fishuntpesca.it/file/jutukuvixif.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/94447039915.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/71494595616.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd289c2df74---piwizimokunabodirogego.pdfIn PDF document text
    • http://www.toptehnik.si/images/31994204190.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/vukabusojopojomumasezo.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/ranemonisebifewemoki.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/fakimuk.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b0302c032d5dd5ec411fdb3011344f66/32713756286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sound+of+silence+disturbed+piano+sheet+music+free+pdfPDF 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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 17124 bytes
SHA-256: 41071ff46197f8cf3355bb5c14eaad81d41259042495cca7214a95f61e3baaf8
font_01_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC0 11200 bytes
SHA-256: 6720e75cd0ef250f96b96761aedb119bafa947e6800989edb814798736ae1bda

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