Malicious PDF — malware analysis report

Static analysis result for SHA-256 943585180cc4c844…

MALICIOUS

PDF

150.9 KB Created: 2021-08-03 05:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b05ffd4da1983986f41bf001bb25dc46 SHA-1: cd48e6e04238e9ef7b751b2691f200ed09a81ee0 SHA-256: 943585180cc4c844b73a32345ca818148735046e7264bb3b87e0fc5b81c1f3b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://milliondollardesiclub.com/upload_files/featured/files/bimubiferejepatapo.pdf In PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/67970098014.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/xumigok.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b49984ab9bfc7b833fdec22abbd8d32a/79157709989.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/6konmtorm5j796g93thn0v44r2/81403521248.pdfIn PDF document text
    • https://blugarden.eu/file/fawonilozobajali.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/b7kns9rbmbjbq3l0hkasrv3rku/repulubetivuwese.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/94738392980.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/35764912764.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd7fdec4f8---xokewepe.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xifeselatowuwar.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/79128653927.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098337c2009f---gipareputanowudogaxe.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/debogamedokijugob.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/10723684193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dar+jana+international+school+jeddahPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001d801.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D801 20552 bytes
SHA-256: 31b2b4b438ac3fe747525b6633deba922f1679a55b3db63231962901d3fe6518
font_00_sfnt_off0001bfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFEC 10600 bytes
SHA-256: 98497ec2b6ee97b8e11ca3c924253dbfc19f61bcaa5e6526f18f6a216fe434cc
font_02_sfnt_off0001fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA1F 25812 bytes
SHA-256: 16d1137d032cdc9903f33d4749ac5c8605cb46454f34e98f397f90e824d7ae00
font_03_sfnt_off00023477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1