Malicious PDF — malware analysis report

Static analysis result for SHA-256 2052dfe5fe911d39…

MALICIOUS

PDF

64.3 KB Created: 2021-09-24 17:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0203067c9b9b7b8c1707d29acc55f78d SHA-1: b663ed4d8d8985deff2de60926ebe11e46a92fe2 SHA-256: 2052dfe5fe911d39e275fb061c1e542240f1bc8e65d1e7b6e2eafe0bb5ceed61
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5020

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 https://wastran.ru/uplcv?utm_term=my+talking+angela+2+ios PDF link annotation
    • http://cobweb.janci.net/upload/files/8457561786.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/wesaxavasub.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///92997662921.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/levabugeturebaditojulix.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xatubumumoraniputagukab.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/migolosapiwugun.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/31667618939.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/movimaguwukexekugokaroma.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/19249317301.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614719ea008b2---kolimanalewizubefifizobes.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/91810319671.pdfIn PDF document text
    • http://kite-surf.sk/files/75654668281.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b035c6caa88737c5231a7c1fd8323153/xajapibixuzopiro.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/fogogasalujavebegile.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/letene.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/47609795991.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/pipibuvase.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38262a23d---zozejevavanaputewixot.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec86172ef---vigexumojaro.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ba43a8829de999516f9d76be74189e48/kegezexarikidavuzidu.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/toguwekujijewoxujozixeta.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///55321706891.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/13087545832.pdfIn PDF document text
    • https://luminex.pl/upload/file/53880086634.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42920224783.pdfIn PDF document text
    • https://premiersuli.hu/files/files/burexaxujosuxa.pdfIn PDF document text
    • 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_off0000b290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 14768 bytes
SHA-256: 91c3b131cc1fea75acc4446b4bb14a17c7b1ccb02a5ab00b6ea64e271f40f7e1