Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c78f6f8619c789…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 05:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3b4461bae22de7c4b51f598cc9e46d7 SHA-1: af6624f48fbd79ed7beb2e2a0908ff5865e613de SHA-256: f0c78f6f8619c78965c266789f3955fbb572bcc6884fbafb741bdaf10effabb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://solturism.ro/images/file/69919479879.pdf In PDF document text
    • http://www.stemcellhairclinic.com/files/files/momisawugaw.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/rititilido.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/71321548700.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c719b7929ef353b775f68ddfdaaea875/vogojifesone.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/25235265487.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/52451975220.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/81284097910.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/wuxulujajizeto.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/vevusezuwub.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8cdcf3dc2---69553743488.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/moxulona.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/70766678587.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d142775cd---93660214413.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a270a29871b65fd25341e570cd01856c/wogujo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6784a0c8f---kusajile.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/57296511309.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/nurosulogazagezurad.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/mojixim.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/73987466549.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/nebuzexese.pdfIn PDF document text
    • http://seatraveltx.com/uploads/files/59957262869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hola+fake+location+apkPDF 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_off0000b58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58A 18968 bytes
SHA-256: eae85a0613f7bb9b9f17b34dcd7bc46eec1c0e76db64160697424d01de64e6b5
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10288 bytes
SHA-256: b2bb7c1f9b1dfdbca06255e42c7378211d835580f3ed653af09725551fb8f4a0

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