Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8d0c92810b7850…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 21:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6273bd6e882ea8a8864391617d2a0609 SHA-1: 884ae324b68550daeb06ed547c13dda01e38b9a6 SHA-256: dd8d0c92810b78501ee283454d8eabbf3a9b5ae1397c75bf669b0bab0f8dc944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the file acting as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=hibernate+tutorial+javatpoint+pdf+download PDF link annotation
    • https://nepalmicrofinancesummit.org/userfiles/files/99548929985.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pn7ueh82cbk55hbjmjancjn9o0/57556151553.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/50241250975.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210525103857120.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fiqvf9fpa5bl41903oh2umseae/rizetu.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/8898897782.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8c37d448---takavokovivupelutexe.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/56186348181.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202108220629262908.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5725079e77ef90960f378d4d13cc7577/jatibujufuv.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/ropekixawizaromukurifuze.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108032023198395.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/161051df5a8a66---xikowasedo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/97c44e73b490b670560722a8dd86a4c5/ripikuwovos.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/igv9gs9oshlc4scbmrma9mfrfh/voxesiz.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/37855673952.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c5eff99bd1b340ab9831090ee95694e0/49579716829.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e23c07306f---89933416207.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qe4v5ssau7e17tprdo3v4clqaa/9273679752.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0532e7e119---36838213293.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/tupifo.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/10454263602.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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 19336 bytes
SHA-256: c6013d1586d39e158842288dd22f20277d9e312bab9409065edbaa9134f2de06
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 10836 bytes
SHA-256: 2e91894ba2011fa5eedaa6898711c624faf9a4dcb7203b74646e13bd47e0fa42

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