Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58816fcb256439b…

MALICIOUS

PDF

80.8 KB Created: 2021-08-06 00:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0143355a41d9f5350fe361e41fe6c376 SHA-1: 1aaa70b2dca9d3bb0043ee933e749e9a14609dc3 SHA-256: e58816fcb256439ba78cd9ee2821ca58b2162bae8445ab2b1c015fc4085a058b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7de76jdbkqj0hoeoi7a12dpcs5/97214120030.pdf In PDF document text
    • http://vanhacollection.com/images/files/dolatuvewametaz.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/071ec6b17ca28ea3ea8433541a4c00ae/72986968580.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/133737eee9485e3e3afa647e6eef1fd3/detemokaxusipesi.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/sulugudukasaposa.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/44282310807.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a940e5cda610acf0cc0ae5d3dff90588/39745208365.pdfIn PDF document text
    • http://minhanh.com/files/55394550848.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2679b9a988dedf0128f41b23a0ac79ea/pifopa.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e128cf04607f4ae115bd5973b8498f7e/43615160481.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/toxinovabefuwedanamozi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160854943e5424---nojukogepajobolekilubefo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dokilopazufefu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/6e7jpg4u6de2nuup8lq5uhp759/wopululixededizobevoni.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/xaminewamisikunabuwa.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vutomo.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796f9548934---46205632162.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609655851a026---92864553416.pdfIn PDF document text
    • https://pcetravel.com/files/file/57976256712.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bamijemiratanokifugaj.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/98053999221.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g2s5vklg86eu7jqk5o9q95obh3/sebikadalulunezib.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/4648521294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+reset+avh-210exPDF 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_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 18120 bytes
SHA-256: 2028f968fdc1822bb2158a7dad342d0f6fb2998e63e26a7e1b0528db5cfc1b6c
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 10536 bytes
SHA-256: 72d9932ef75bce5cfcd0aca05dc9a81580cf46eb13d2ce776bce3239197dfa39
font_02_sfnt_off00011baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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