Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4335390b069614…

MALICIOUS

PDF

168.4 KB Created: 2021-06-19 13:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b287def96ea4a9a2513c945cbbfb2b9a SHA-1: d9945000fe7e1634bc253a2835b41eba0846f5da SHA-256: bb4335390b069614809399f2f1c4349af8c16cdc74e60127bfcab8f7f365d302
156 Risk Score

Malware Insights

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

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 0.9988

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 http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8f84ca5b---jotiku.pdf In PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c324d6e85b---7371015072.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/42igikma8irt6idg2svjepc0t4/kilipanok.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/t58dkt1h8mjshbj8eqqog8omn5/24783941443.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/83679585933.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/73acc4f63d99769cb524b13342dfb70a/xepepovefexoxupopotaza.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/630461639dddac5157126231e4b8d684/56990633335.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf7fea26d---17555224564.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xikawufelifikefimivepapak.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd52e583eb---babiwefinu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2c177742a---11419171864.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a40da765a2538ce11f521186fde86bca/paliwiguvimogufigux.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/36266465803.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210531002852.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sao+war+of+the+underworld+episodesPDF 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://scripts.sil.org/OFLIn 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
font_00_sfnt_off0001ba93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA93 44792 bytes
SHA-256: e714d3d5534238e50f5eaad2db313cc585f6f10086e6c327cc19dff80b2f699c
font_01_sfnt_off00024393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24393 5324 bytes
SHA-256: 5c9c0c2fe7f5f303a1f132160224d985e656207827ded38b0dcc9568f2a4249d
font_02_sfnt_off000255b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255B7 12260 bytes
SHA-256: bff960667e0549d58714e4771f985336c7c3560e8083435382a5ac2fecd9d383
font_03_sfnt_off00027e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E26 16212 bytes
SHA-256: fc4a7825cf4c0e57e3522fcaa26ca549a2c2fe3786759935493ecdca1570bae2