Malicious PDF — malware analysis report

Static analysis result for SHA-256 223a5203d1f89d0a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-04 19:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c0c65fe58f36f5dfb2432a9cddb0b4d SHA-1: b949758a6adac5d2d824080a54a36584de6c5e77 SHA-256: 223a5203d1f89d0af82559219ed447620736c990819d85bd7f39346b2bbc5378
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URLs point to a common tactic of using compromised sites to host malicious documents or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7885

Heuristics 5

  • 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
  • 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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/icej409u4mt2o88up3i3m6gqr0/56683253192.pdf In PDF document text
    • https://go2germany.ru/files/file/1784730491.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/avuo54nfji0mndf0vulf5gjjo2/fepitarutu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/af6a4e7aaeb4b8db3d3d15ebdde01731/84827477446.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/12734732558.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4811c9d369d891b9c8b9ce762e5c6f7e/napivef.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/kobujajarop.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/vapojejoxokepaba.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081702a083e1---86968933562.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943fab513ce---gaxofuxokefipulixu.pdfIn PDF document text
    • https://arerp.kr/data/file///zelijopexeliwi.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/31216264464.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bac6cdb0ff8---rulunosogije.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/judamaj.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff03748af---89443691710.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5c9bdb7a1---61438762977.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/pirawakozijunasuvadig.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5cf84f0279baf6dfaf3e6477b0ae639a/zelabez.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/jusetoturavo.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/joputabugipikuwudes.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a4aamacpm1p4785o65qjtpcq97/94972234318.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1d88a476a072d54265e15e1c41e832c2/zixotuno.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/79912533013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=toefl+itp+reading+practice+test+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 18388 bytes
SHA-256: b1a23a76a4a95a72f1dc5f100b54a86b0bffc7e89e60320bb34e014b0ec1e301

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