Malicious PDF — malware analysis report

Static analysis result for SHA-256 05eefa3ffb5298d0…

MALICIOUS

PDF

79.8 KB Created: 2021-07-04 09:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f51732bb91a2e0497ef3b74f710e71ec SHA-1: 85fe75b770a884d5dd47e6a87f6f9070c17a68c1 SHA-256: 05eefa3ffb5298d02bd0639bbdf58047cc4bd5f217fe3512afc65237d321ca2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zlatartopalovic.rs//files/rupitasofegifakilemojo.pdf In PDF document text
    • http://renovator.cz/files/file/gevodeduguzewu.pdfIn PDF document text
    • http://recrute.fr/files/files/29645061442.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ec54b958---regutejosawokamekor.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/puziwobeve.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d8be152dbab35f74213ea38f4f5587ec/gugumijepimaro.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/karijamalozuzepafobedena.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/28716060816.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/16881895629.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9e5f9b98538eeeaab46f0ceef2187fc4/gojatu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/89427098341.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb387eaf05---6021065000.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/71519320628.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607389d1926ac---jebedoxu.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/77847028429.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5573429c0---buweli.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b9bf76df4---jitomibipux.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2c412dd91dfe8c23be636eab90e8486a/zokajanubukunuwuravuvol.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/jetikimofazuruzabopuxaser.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/gesisapewaxuj.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rqdo07brbi4nde503e3tsjpvi8/felabeve.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b0f531076b153852a957460cdbd10050/dimor.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe9fa36a3---xedavebez.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/58256043123.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504104900388820.pdfIn PDF document text
    • https://digitalcontentmarket.org/wp-content/uploads/2017/11/Solution-Manual-for-MIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=callister+solution+manual+9th+edition+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_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 11060 bytes
SHA-256: 2b4a07366669a8a61c771eec8d01dab9b8fb07db84ef36741c9d9953f72fb9e2
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 18180 bytes
SHA-256: a31c6d506ef12ed7be74b9e7183ef15cd07d6c4c6086fd15953343401ed91cf1