Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45e8f2eae0e4ac3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 21:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13df1064e9a05930ebb2e6868cf1ab14 SHA-1: d68c0701d42049920b061d4df197db2a89c4bb8b SHA-256: c45e8f2eae0e4ac3b65532b5f93f6886dd9824473f5faaf4bdc63a63a41bf276
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing a malicious browser extension or update. While no scripts were explicitly extracted, the presence of numerous links to PDF files hosted on various domains, some of which appear to be compromised WordPress sites, points towards a phishing or malware distribution scheme. The embedded URLs and the overall structure suggest an attempt to deliver a secondary payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3fa381c7---tugiseridewum.pdf In PDF document text
    • https://phukienbep.net/media/files/gukovezoviwaxur.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/1149028623.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/20653933605.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/53875556815.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vebiferitelororuzosote.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/34289700796.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/88757321096.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/mumozememafomugesej.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356559a024d---88008790955.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ade9f474e6---69064235711.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303af07b7b0---rokag.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/60610127826.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/06/99268293889.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/47779374949.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/54728677722.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/868304b15c87bc9b8401c65ce0a860f7/mukovudilemolufegum.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139794971dfe---31653577010.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/92263391697.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/72435276080.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/35878346540.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/49737255440.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/20915846843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=circle+emoji+copy+and+pastePDF 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10952 bytes
SHA-256: d535099168929f95fa82e2af9cbbef42e7d032cff5925f588e66b1f18b338a5f
font_02_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 17128 bytes
SHA-256: ec93371777a5b88a8f6b58799de35a79dfca2ae27e2f0593edf9c0268435f8ed

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