Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2e5183cfbca151…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 09:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42d7067b1ec6804d01ff9c395dabada2 SHA-1: d493baa078cd00fbda0dd2545b43701efb4986bf SHA-256: 2e2e5183cfbca151ffbda4808b2cb7b6de83d3fe8f7032e8f76d6e13686ae59a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is also noted as potentially compromised, with duplicate object bodies, and the authoring application indicates it was generated programmatically, likely to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://sealskinz.ru/files/file/17703001963.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb699c1345---87660416337.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc64cc6f7b---dugegejewujesope.pdfIn PDF document text
    • http://usateatop.com/_upload/files/77598770665.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/61549132240.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/xovipikub.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/78861f26f2658710bfbe387d42f727fb/14623272530.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622091059.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/80071606577.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/xefupixewegerojeza.pdfIn PDF document text
    • https://krossi.ru/images/content/files/48723376912.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/31826528054.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/funonekeman.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905a94124ab---48782192225.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/77615725272.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/bc1bbbdb7088de99a8d21e0d41703468/92639430039.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/fupumu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf74dbadc---zavebolepiwi.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/ac5d6fed4d5bad2eef78271a0665cdbe/jatarojijarapukigigo.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/rigoxupejigoxilijevefa.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/bipujokufalaz.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/zanabapuxomo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-19/20210519131323491631.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609670025a79b---pufibagimo.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/75954608204.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16102d446d1fae---fowax.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4aab4d0aa1bc523110cef22a8dd3aa47/40655821483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=learning+driving+licence+test+questions+pdfPDF 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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 18160 bytes
SHA-256: c3260ffeb054466bd91e045669d60de27d6a8384406e1ba92e70d02807163353
font_01_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 11064 bytes
SHA-256: 3cda627ffe3ed0171689ddbc95c49e12f035665f2f77514576e70dd807d42292

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