Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af36359bc839c56…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 20:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d1b449ab5587a62c347dd864373aa41 SHA-1: 5934751ded546df5eec4b07853b962b7fa92cda2 SHA-256: 0af36359bc839c56dabeb0c5d37055c46b8bbc891f58cec8222fdfcbc46cef29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being part of a link farm hosted on compromised websites, designed to redirect users to external URLs. The presence of external URIs and link farms suggests the primary goal is to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=gynaecology+pdf+book PDF link annotation
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114cb93126da---67116295886.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/tijakeses.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16128d72a8e768---41821026819.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/nagokat.pdfIn PDF document text
    • http://ceroki.com/image/files/60409298896.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/41635885515.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/85395167610.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/64747294405.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/58989215420.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/48989319896.pdfIn PDF document text
    • http://navigator-33.ru/media/file/98792235316.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/kokofib.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4de70c8ae1dd9bd1b7f0f409a7acdbb4/lukopunuroboverilo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-9/20210509190103558642.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf486c393f---segilizalakuzerawemujibi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ad561bbb4b8edf925604e245024b62cf/88874932804.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/77360332285.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/95883734368.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8f3692e89e821cdf224e4e327a902b1b/zudilafujofatukaberiba.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021080412061628.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1caf39c52---5608047282.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/57861431037.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/memigisidesofegelo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a983abafa4d---62068725969.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_off0000d044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD044 10724 bytes
SHA-256: 2c550750bdfc0ffa342b315cc6f36c54c753ec73f5e6b7806c8e1244bd83b944
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 16780 bytes
SHA-256: 5ecdcd3f754c520a093cc5b2fb441ef7f8b960437784494f5c50144b8d230d4f

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