Malicious PDF — malware analysis report

Static analysis result for SHA-256 51609291a9de571f…

MALICIOUS

PDF

83.6 KB Created: 2021-10-12 14:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 219bccef481e9baaec90767dac6c7736 SHA-1: 5fcbb7b2d88acb33cf5b1584e4fb5dc68d1bda75 SHA-256: 51609291a9de571fc76cf8c0b7c32f76570bcf957d9ad083b93ebffc198a3ad1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads. This pattern is commonly used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bronia.org/userfiles/file/bukudomibetulanojuxevagu.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/14401255950.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/nuxoketikisekikotuxezexi.pdfIn PDF document text
    • http://surestegc.org/documentos/file/8895913356.pdfIn PDF document text
    • https://thaodienland.com/fckeditor/editor/filemanager/connectors/php/temp/file/dekusuvugotegu.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kovomasubogapelara.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/gisunasinadiwader.pdfIn PDF document text
    • http://cudicio.it/images/file/56041368396.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/33554419058.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/48426439075.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/nezot.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/dewofamikowowowogawonazoz.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109110653032566.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/5703893894.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0e60e995ee6b7d521c919f1b8a5c8115/59217773489.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/40073296669.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615211cd538a9---diluvuwak.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/domarerujodalujezivezodit.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/989c3c4d9a82517dcc185f2c8a9b7c62/ritewapavekinik.pdfIn PDF document text
    • https://yellowstonewildlife.com/7317046128.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/mujagu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b85b82b594---pozogevunolitugesaxinud.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/tiwobos.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=how+to+write+affidavit+for+lost+idPDF 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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 18616 bytes
SHA-256: 4b7149691d8aea44fc4d78c0f3d06b0c2dddbfb20433d789306edde76357a28d
font_01_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 10384 bytes
SHA-256: 01a4fc4b7373fdf43318224f41a143aac4b43c33998187229e8811367596f422
font_02_sfnt_off00012854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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