Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50f0da4c8f74f7f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 17:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7c624a5709a95c1ec77885c1576f04c SHA-1: 27c05e6fb27ebbc63e72236fea7eb08464e08d72 SHA-256: e50f0da4c8f74f7f8a9e76db39361a1a60d17d481380e022f1a46c5981a04019
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://drafthe.ru/uplcv?utm_term=can+i+use+a+firestick+on+a+smart+tv PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/967d773194e84c074296033da3910715/jizemepirulunoxopaz.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/puginulodegosaxukarota.pdfIn PDF document text
    • http://zgic.ru/!upload/files/vowinobegowumaverulotim.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/fopupoz.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/liguralaso.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219222055356303.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/66928597182.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1e3d95791808cebcd3f34c4a49ff7cf5/3796188167.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/75778984454.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/zirekadugulefol.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1126556301613594235fbea.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05117a99f---51502728309.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/nosasigudedizixibuwuso.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/loxunetulotege.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/mibufefunobo.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/51283552171.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614258ab8f91e---lirugamibiliru.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/67205646076.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/09c749e165d4682a9a32a4818f06827a/sujavepema.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/xefebed.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/vobizoruwadarosemupog.pdfIn PDF document text
    • http://budropol.de/Upload/file/zewabewetujeribezijej.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 17200 bytes
SHA-256: 494785145e7e4fb85beca8b6ac80d330b3bad6b7b0c65b65f4985898018a11a0
font_01_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 10740 bytes
SHA-256: 4b386dd67b45912a1a514ecc7c1f1c94b412f1485040b2cb1c5485c9dc49ab73
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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