Malicious PDF — malware analysis report

Static analysis result for SHA-256 e894233f68e5c2ea…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 06:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6da165a9ae6ef6d9bed6b171a855df80 SHA-1: 749ca2904c229ec82fddb04be103f9fb64c8770a SHA-256: e894233f68e5c2ea243f3e7ec92d2482ce335ac9b42a2cea8ac78647d1583f34
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. It contains numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the 'Link Farm' heuristic strongly support a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=separate+pdf+into+separate+documents PDF link annotation
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/675jnkfa35jmbkfc5r7cd07943/zamezezil.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210826091908.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b0a515c8bdae619bf8c96669cad90170/gumipiw.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610513d3a92a4---vuvonejateroburelubago.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ccada76ab---96211916455.pdfIn PDF document text
    • http://sakem.org/userfiles/files/22300835687.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/64279844942.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/78108618360.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610054bf3e4f6---rinafiveb.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a108a242367c6bc40f792688692e7562/xanolowika.pdfIn PDF document text
    • http://jonme.net/ckupload/files/jafobeta.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/42872163830.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076816788b57---48500542924.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/88e68dbe09ff672a9c8d354bfb31d92b/64773216956.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5ba0780f493b8c5720fdaae6c2672984/22055088593.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4f780d930---fuvul.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/95426991486.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3116242dcf---sivixelaponewunesew.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/3847216651.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/jonexilonomibaja.pdfIn PDF document text
    • https://negaratoto.com/contents//files/gagekuk.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/75073237121.pdfIn PDF document text
    • 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_off0000bc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 10908 bytes
SHA-256: 8e7767dca091887980430f096d095effe518ce154777f56800331f2993315ac0
font_01_sfnt_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 16216 bytes
SHA-256: c6b954f5b538c827d23e6366785baef15c3ffb3c87181be264dc5c155f552da2
font_02_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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