Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59e40d7f9032588…

MALICIOUS

PDF

74.6 KB Created: 2021-09-27 19:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2153538ae97ed295326430249044e8d SHA-1: 9b968dceb57491d907f7e89ac04f19b7e7235972 SHA-256: c59e40d7f9032588f6789669b27c6e1e6b970c965830f795e9d8d9840e55dbcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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 http://dulichgiahy.com/upload/file/59873543354.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/waraberirobuvilujeli.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/nexewazawoduvi.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/worovuxinowefakujatisaxef.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/4568479442.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/72721011674.pdfIn PDF document text
    • http://yuhongzg.com/d/files/pexekevu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3763c1297---kutuxadale.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/gemunonategedar.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/40411627791.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/11938451747.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0581e0d4c---lafovufivaxumavonumefev.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/49458442210.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/sugosivodalen.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/18715669038.pdfIn PDF document text
    • http://vanhacollection.com/images/files/205318014.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/29037083832.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd57ef2f22---jawitekuweno.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7c06b6079---wujitoli.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/ganenuginigategokunusel.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/xugur.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/52379667578.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sawutefovip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+kein+internet+trotz+wlan+verbindungPDF 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_off0000bafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 10780 bytes
SHA-256: e725191b920997e9b9fb2c26e156723a61b91f25841571aade74ed926d6250ef
font_02_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 18812 bytes
SHA-256: 13ec595b15ace2f996ec00e24da96bccab89a4e7a9a79442bf167d56298becff