Malicious PDF — malware analysis report

Static analysis result for SHA-256 47eb1d9b2d51fcf0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 07:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbee816e344031d4df005e6cfb07b197 SHA-1: b8398902669d98d260c636c7befcec9c7a4790c5 SHA-256: 47eb1d9b2d51fcf00730dcbeef25cde8ca789f844e3dd03cb7918fe135860562
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, some of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware disguised as legitimate documents. The presence of multiple links to external PDFs suggests a link farm or a method to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://webinaris.training/ckfinder/userfiles/publics/files/rumifeje.pdf In PDF document text
    • http://capmar.eu/userfiles/file/zutevigevodupifunafonu.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/labus.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c00423d442f---tolananesobomixo.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/fiben.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/rakuwazawalififeb.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d875d3af62---fitimojanaroritakad.pdfIn PDF document text
    • http://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/dubukidod.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2981d657bc---lexux.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/funuvituxagumim.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/totekonen.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/69828768644.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82542032964.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ndq44ch7d79i0jb5qtmj3vsu0/xirivuterelixo.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/labaxedega.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/36197663367.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16218917328058.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/65673512502.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b4682662---livifafinowit.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a6450116d3e7e3afa1dc8d5d27b96258/86047317800.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/90612123586.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/96272804637.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/60117441982.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/fedijexipemobuberegedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lista+de+pares+biomagneticos+emocionales+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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 19644 bytes
SHA-256: 1e50a7f22a640644aa9c0f4fedd33be9c0ef456ed1c2d106a318f585868dc9ca
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 11060 bytes
SHA-256: 578b11184b75f0226d6606cf2d7e4fdf4cd2a1066917b6df7b963f8d10b35bc1

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