Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f81f14bfdb63199…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 17:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6998b30b978959d6ce200b69484985e1 SHA-1: ae9ef2037cbe2d6689554e03533192355f5a3caf SHA-256: 0f81f14bfdb6319990f164443bc1a7f644e280fefbf1927406dddc86d48c41a6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/aafcb75e83163460ddb3fee29618dedb/wibufumijib.pdf In PDF document text
    • http://loscogliodifavignana.it/userfiles/files/savulevil.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/xawowarilatavazupa.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/xinukirupeve.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/bebasaxosesotamufanu.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/65414531973.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/88717854742.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/67822666313.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/34366690729.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/ronotafuwijapobigitunu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9487e29f---zilopareneweperasasuvas.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/50091827661.pdfIn PDF document text
    • http://guchen.ru/d/files/85334298288.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/sutunuxomitum.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/93121599083.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/45308815678.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091212230788.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb5dba7ce5---jutemogit.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/zodikepatej.pdfIn PDF document text
    • http://handgun.ee/media/file/76828710321.pdfIn PDF document text
    • http://nineslash.com/user_file/file/popoguwopuvisobibuli.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/9850201618.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8ab3590a4341661abbd40552a9f5c97f/65868581376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=learn+chess+iosPDF 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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 10140 bytes
SHA-256: 017be18e8fd0dafd32ebdd3bca6f5d1f64fce0c984f14e0976aa99426f5a8c01
font_02_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 18040 bytes
SHA-256: 40b52ce2102b19fceb14d513baa6c70ed1c3a0bf9decc206991cabd89ab36423