Malicious PDF — malware analysis report

Static analysis result for SHA-256 813b8122ce705c34…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 03:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42d0f0d728e23146c02f613d30420e04 SHA-1: 290f5512e89014af141d8d7ae9f23ba4661e3461 SHA-256: 813b8122ce705c34da16142ca1d9ebdc95ee1c806e44b63591f79c2d46fc184e
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed multiple heuristics indicating the PDF is a link farm, with many links pointing to compromised WordPress upload directories and disposable hosting. The presence of numerous unknown URLs suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4291

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://best-of-geldanlagen.de/userfiles/file/12267302582.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b2a56d51ca5faed92e82a8b08613a54/81232481295.pdfIn PDF document text
    • http://wohntraumgmbh.at/6774742532.pdfIn PDF document text
    • http://apart1day.ru/file/guzuwuk.pdfIn PDF document text
    • http://net-marketing.hu/images/files/24955743246.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0128121539f2ba0a4a2e82e7dc7d2b15/9098430495.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/60516853003.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/bozelozunu.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/23408383404.pdfIn PDF document text
    • http://ergakiland.ru/files/files/84786377258.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jajazifidi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa010455d---bopalevusa.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/sujuzejezuvugowomirapupi.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/38097639734.pdfIn PDF document text
    • https://cardolf.ro/files/81313963456.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61490a533200c.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/92930169777.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/78880057408.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/mutaj.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/320aa27e94883449b7e5491bc6a72759/jewikodevoferubiduwamil.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/61222232548.pdfIn PDF document text
    • https://webrobogo.hu/kepek/wixerogunofidevorajirip.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/laxovokefe.pdfIn PDF document text
    • https://basisnomor.com/contents/files/xozemolonolonoborema.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jonosuwonifu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd515f150---18742834581.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/xexojiser.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/19431431065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=x+plane+simulator+apkPDF 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_off0000c4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EA 19276 bytes
SHA-256: 491aa4951ac4f7af8f4d70a5996afa32c5faca2f9d9a6fa8cca7cba870940259
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10612 bytes
SHA-256: 599f3610d8b6bd962a01930cc20967eb3377ddc73ac184793d3c0db7809170a3