Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d73986259f8fc4…

MALICIOUS

PDF

70.6 KB Created: 2021-08-09 01:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a3926fc98487e49032abc155962c72c SHA-1: 97a2d65f4c7baa5429e7fc76278a7e8cf817dbf0 SHA-256: 88d73986259f8fc4739a354e9f8d9b47b011416a109d24b9346ce6d4237abeac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9371

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 http://toitureetfacade.fr/data/Files/tunuvexizavokifefeje.pdf In PDF document text
    • http://kpotplace.com/uploads/files/sitikamijosonidelef.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca8648132---50176876502.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/93581123784.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/m8f2n497pm9ce49qrp8o8bfgu1/majawesafut.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a134ad983ef---26855910229.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/35542156553.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/vula7pr9lav89plvqam88va8qa/gefafoxezofebiwu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/jumazukubase.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/17402630619.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/tufoxoboparitotubojobuz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e277d500371---mazubarubopebifekofike.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e3e88e0a1---69456948660.pdfIn PDF document text
    • https://avela.md/userfiles/file/60436762804.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeba344889---33258053458.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/ladugomotibaviboxusofiz.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c4256e6b4---28827955372.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9575cb03b25350a9213ad4d87f976826/bebexujevegogarudolozoti.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f3436afd9---88997684457.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/manesusinodilavidokut.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/73941697801.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f8cd2acb---marobezevimanujazidulasaj.pdfIn PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/zubamuvibivovun.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/kuxikitametugamexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=las+cronicas+de+narnia+3+pelicula+completa+en+espa%C3%B1ol+latino+onlinePDF 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_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 17456 bytes
SHA-256: 4c15c718db1791efd9aa4d775e1983ad4c83b736bd98766b1781752f89396f58