Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66233ef3d810dc6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 11:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2678b18b926dc941ce70a113a3ab1638 SHA-1: 2d4a7eb2ec9e8e6c7b5a2fea08b8e2ad9a2e1e03 SHA-256: d66233ef3d810dc698da32135c147a9b84d3c03974c628035ad5eb75fad14040
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or malware delivery. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://avstralianature.ru/ckfinder/userfiles/files/sepavewipixuretiw.pdf In PDF document text
    • https://cauthinh.com/luutru/files/24672262120.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/puvarisukalupenuxon.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146454661c34---88220999587.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25ce95105---56473690128.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/monexo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c823597cd840990d062ea606b2020fe2/weligakuvamuragofid.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/48405175443.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb94929fac---41607819208.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/64124259675.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/pudagudokanovexakarafikud.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/67689703360.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/74664701071.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/depururovanunitugogegul.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbeaa73f0---jenosapufa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/68kulut2v5lmo2abfsu55uigc0/dikitejemijoderaxubari.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/15494496527.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/wajofob.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/31925667768.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/86479230181.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/48361031315.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/89340136339.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/64862003713.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/koturarodipekawedavike.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/zogisakebad.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/mokivalababezenejibev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=robert+greene+las+33+estrategias+de+la+guerra+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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 18428 bytes
SHA-256: 5bed28cfad05170fa89782ce39f986af326cc6e61207e4daa243643cda0ec1b2
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 11128 bytes
SHA-256: 7ccf8aef281ea2bfdca64f00a583257e3cd4e5d4de841eb036af9c6bd8720b5c

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