Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef27304ecf832b1…

MALICIOUS

PDF

148.1 KB Created: 2021-07-03 19:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d7fd3d029a11a21b2e8de4a6f7bc729d SHA-1: 001203cc879ec89b0a8f7b71d66e37f789bb2b46 SHA-256: 6ef27304ecf832b14e422fb13bfd14373506e47a57df1c84e620ab5f46dcd7bd
196 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, with heuristics indicating it functions as a browser extension installation lure. This suggests a social engineering tactic to trick users into downloading and executing a payload, likely for credential theft or further malware deployment. The document contains numerous links to external PDF files hosted on various domains, some of which are associated with compromised CMS upload storage, indicating a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084798883b97---puwelotojedix.pdf In PDF document text
    • http://mega.kz/media/upload/files/70899704886.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3617f5abd38643975299962eb2e90fb0/talisuxapenezofap.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d89b3ac3---nivukolulaganiranefenus.pdfIn PDF document text
    • https://jagominum.com/contents//files/wonivuzusaxezebuxatuloz.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/99331934209.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7ab6f6b2eb458e9fcb9e0cec0be7cf3f/kapikitesewumozev.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/l4ps71ou7qg5gnn2mhvhm6phph/85255883341.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/84956289945.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/pusefaxutepukiditotojed.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/43046419391.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8b4ef2dc---43915195707.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/49792c8be3676b8d625be67ed794b05d/kogezurabe.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/18583601538.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/98903362041.pdfIn PDF document text
    • http://roocenter.ru/upload/file/nuburer.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720a643a004---fomas.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5d1b6e0b7c0016416183082a0d77e272/857304313.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/kuladevixuzopige.pdfIn PDF document text
    • https://memoservicesrl.it/file/mezaxefowotopekox.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915887a91ce---jevividusewubexavujinovu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4610f585dd---88376712137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=expressionist+artists+21st+centuryPDF 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_off0001df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF25 19496 bytes
SHA-256: 0b90051c7089a87c767334439e545f9724b540d2c1c180d1d940275416c5e79c
font_01_sfnt_off0002114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2114B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22962 10792 bytes
SHA-256: 94fb9312d6d5339f0c725edff647b23edcd049f2d4cd9a06ed6fd4884be35a2e

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