Malicious PDF — malware analysis report

Static analysis result for SHA-256 82800b8c766b0824…

MALICIOUS

PDF

97.0 KB Created: 2021-09-09 20:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27a277bad76d9d93784ae3b4531855ac SHA-1: 99a635a606abb698083483129204290c8045943a SHA-256: 82800b8c766b08243564e50c29d6526f6eae799d974e51575df2ff44db6310fa
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier clean score 0.1354

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ux02.wadhost.com/js/ckfinder/userfiles/files/vabividamipemuje.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60e969f44---mepafufujadalumazokukito.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c6f36643.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/1832267131.pdfIn PDF document text
    • http://nktrading.qa/file/files/28732074838.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/39865439597.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/13199803815.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///xufabifulif.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/35489901586.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/16668820590.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26317388339.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/mofugipugevapivovi.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/8849426308.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/lovezif.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/tuzimelevisawisopipin.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tevamorub.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1dde80d6---35118416788.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/84245256839.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/munidagoropaxefa.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/7375902650.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a2a1fbc4---xifelebugubujexuze.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/vadefo.pdfIn PDF document text
    • https://autoskola-scp.com/files/dosikizepigobokawobuw.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/58607420516.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/18210240571.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/81809778900.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/nezavavujejemowelaboma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=search+rank+trackingPDF link annotation
    • 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_off00012eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C5 10340 bytes
SHA-256: 8372ca97cfd5a4a3ed86a1a1d6f86376b9ebca511d7ffbf6cb3388db3befc4ca
font_02_sfnt_off00015e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E11 16740 bytes
SHA-256: 411417744c66433b06dd37a2a3cc6500ef028e0cdfd34fcd69f34f9f686faa5b