Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6f8b4608cd2fc4…

MALICIOUS

PDF

93.1 KB Created: 2021-09-18 14:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ecabc8149b1cc10a176dc62c9bc08697 SHA-1: fe9d77b8df5225cd6a0258b459f9d0c629d09535 SHA-256: bf6f8b4608cd2fc4d2798b54039e2545cb08c0f3258ac36f4383a91765276078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the PDF structure, indicates an attempt to direct users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=how+to+cancel+filmigo+subscription PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614542516eb27---terox.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/kitojopurigufujibilexo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613084fa1b690---8265358360.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/32970652688.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/vojito.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/kesarerofabilota.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/89360992342.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/4967635071.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/pasetijupo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7d2cec7e---zalibedusalubi.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/90476591557.pdfIn PDF document text
    • http://rrarental.org/upload/file/ragajoguwo.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/lunumixabadirokalaxesoju.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/romometupafumopaxa.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d006af2c---36157443885.pdfIn PDF document text
    • https://nyig.com/files/file/tufikuzusawumifa.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/61037301038.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/fojexubodabulezumibate.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161333cb024d09---6863343455.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f37b2b60b---xibekimoxonizol.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/23155912290.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e30715d36fb224f8ed69576ccaff6761/navububafopipiwirut.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/39473166212.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_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 18688 bytes
SHA-256: 9d9b9fa07656a4b970e47b9db8c4caf20d052268971131e79b42621ce9b07c42
font_01_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 11140 bytes
SHA-256: b9cc8a80bcfbf51e0bd4319b413b4d0a3266401a60d3730237b441569c547d27
font_02_sfnt_off00014e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1