Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6403c58b09b8d60…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 18:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89780fa80951e7f092cdf21263b2c9ac SHA-1: f5332c79e41e6e49405aa4a7634b137df56f2357 SHA-256: a6403c58b09b8d60804ed528496643d4fe1858f5055809ae05e929f2cb0f0e4e
196 Risk Score

Malware Insights

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

The sample is classified as malicious by ML and ClamAV, and exhibits characteristics of a browser extension installation lure. The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the lure and the embedded links indicate an attempt to execute malicious code or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://schodylux.pl/userfiles/file/rumenafotatisunumaloz.pdf In PDF document text
    • https://akgoz.zemta.com/uploads/files/nubolijaxotoba.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/63793759451.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cd10c0399061c38f0361b2a88726f381/51696781230.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/sazajifodoxafamap.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcfc627f5---zajibemivonejidixinow.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/80878f01cd629f6718f081e4ee528e86/fapapijixuxajefifij.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/gaxoxugataxemiso.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/47893186330.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/gagugapezufelojin.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/13634085562.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/fewum.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021912445521363.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4i109lj620vb5dgs6cin5rrt03/pusozajepuz.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe185e22ed---duvuno.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/pejojewivotilu.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/80592127262.pdfIn PDF document text
    • http://mweb.cz/images/file/57180929251.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210912191346.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff130d89e---wosurexetupizerus.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/59737333516.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/lutirasimupuweviri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+testing+on+devicePDF 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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 10384 bytes
SHA-256: 919ea49756bbb4b23f056e8206ecfa2bf901e5ad2d303b7e83a57101627ae3fc
font_01_sfnt_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 18820 bytes
SHA-256: 4d1f3dc926d1b59cbac59273daffb8692cfccb969c2c507d0e92f9a27e738c24
font_02_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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