Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3e413e7ead7334…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 08:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 843af74b83b3e9c2d22d7c2f95d044b6 SHA-1: c2d51d49aaf9baef96f33d47852ecf4a1c669fdb SHA-256: eb3e413e7ead7334ef53c04be5f0448088c78347c79f9d60f8bf7a1a2654d610
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The PDF structure and embedded links suggest an attempt to redirect users to phishing or malware distribution sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 5

  • 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
  • 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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c16644205---refudukolif.pdf In PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/65318196546.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/25573229655.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/tagemefomodipetet.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613320aee15f4---11075618388.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/fepuveseruvekup.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/34287177509.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/5547227572.pdfIn PDF document text
    • http://cl-pub.com/files/files/vavirirogezadakipazajeloj.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/28305415250.pdfIn PDF document text
    • http://skolky.info/foto/images/file/zuditaxalusuwojufanis.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/88017245232.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/50284354474.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/61397698137.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630956895_1.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139c22dc8151---20155800752.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/wekaborotew.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/65940520559.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/sokefofefujakunur.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/lujefir.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/temunufe.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ded4ae39---16407812029.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b95c572b68a5df6a23a09959f8fb2798/55520750730.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/fugamuru.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qb9mor0o48atp292d1v222peup/70147244930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=multiplayer+video+game+top+10+games+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 17408 bytes
SHA-256: ed67c7d536ffbbef732bf9e243bac4166fc929d2582b5fd37cad9c93a3cf2cc0
font_01_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 11288 bytes
SHA-256: e7d3f5fcbdb93cdb5076a716352531c6406459ebd3500bc38a1a5f270c734ac2