Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58cd1ac65bb8c57…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 08:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c16d6accc9514481a26413e59a51d80 SHA-1: 711d73c628524ada7940609afd673a16d3e7a4a1 SHA-256: f58cd1ac65bb8c57f0cc2af20e175a1025bddb852bf798e5ac53cc84a109758c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised or disposable domains. The presence of these links suggests the document is designed to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cameradungphat.com/uploads/files/26527587624.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/gijizaviwesomavemulufumul.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/50587124991.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/kikologerunidekun.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/96099449001.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20215308531877.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/gobajibubo.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/gabudotuvoboxakezuja.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/susexusamekuniwonefo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d7e2f8892d92f26a786d51d75bcfb7ef/18239553393.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39724884183.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250a09ae83c---lijugavewe.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/lulikif.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ililm1r8cnj1aof10bq2b797jb/wabevegediporedawe.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/67984799992.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/62083691463.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c070f94921c---14168039246.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/43125455051.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/waliwizedamedurepiv.pdfIn PDF document text
    • https://angkagenap.com/contents/files/64663656439.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/pojalizuno.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wizupel.pdfIn PDF document text
    • http://swotaweb.org/img/upload/file/gujuxetuxo.pdfIn PDF document text
    • https://chptravel.ir/data/file/94012578522.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xekidagokijageva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tally+erp+9+all+shortcut+keys+pdf+file+downloadPDF 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_off0000bbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF8 11240 bytes
SHA-256: e9d7815e84b2f54c68615b8afa794e69cfe8bf6f2b44d445cebcffec67b16e7a
font_01_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 18700 bytes
SHA-256: 309eea606e719b13f0e9e67940d89af589abda77746030735e2ff3f7d96a7a1a
font_02_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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