Malicious PDF — malware analysis report

Static analysis result for SHA-256 d071977bccea10aa…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 10:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d99e1a16b718e5c9987634286aa177a SHA-1: 1ed9d6e50884ead6755c921e1767a29f5ddcc80c SHA-256: d071977bccea10aa6bae2ad9717315d66fdf6a3a9125af61bee497fc2bc124a3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised websites or disposable domains, suggesting an effort to obscure the ultimate destination. The presence of these links indicates the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://indirimlipin.com/calisma2/files/uploads/72530754375.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///tuwulita.pdfIn PDF document text
    • http://vyrukrc.lt/userfiles/file/rozoneroku.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210906073818.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/73415516382.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2ba5ee11---tibijowupuv.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/03ed098d2e3187a87824dea99a7a5fbd/mimivikuroradatedos.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/nagibebipimapatumel.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/fuximobasi.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovawijugamob.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c5dc450c---1766598758.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387b94c5a9f---27231433840.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/rinigidivitoxiduve.pdfIn PDF document text
    • https://alohasafaris.com/files/gobatosifupaluri.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/vavebiresufagotenunara.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/favoponazunozadijarupa.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/ripesegasedagusidaseru.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7l1tua7uqt5vbpa4qcaijmdc9a/safamanit.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/turevelibomurupakadunim.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/levimob.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/vedimutomujusefajagubiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+access+other+android+phonePDF link annotation
    • 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_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 10644 bytes
SHA-256: c99187d05b9b4090ca583fee49e109cac5fde217f9454986e80d15cc10c6d722
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 17620 bytes
SHA-256: eb7711f94c518690b5733de1a332a620903baf06978857ff8bd4c980033fd116
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1