Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54f4cda1904c4d4…

MALICIOUS

PDF

113.3 KB Created: 2021-09-17 15:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c2f7ad10a455200fa1bd574ab3df78b SHA-1: 2544d1d52e467e2a678424e695db9b7e23f599c5 SHA-256: b54f4cda1904c4d4c71232f34a41d0cdf96d778796e9b7c22f70556cbc028efa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=legacy+nora+roberts+pdf PDF link annotation
    • http://whatdwellswithin.com/file/85995422395.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2d444b2d981c9942908d22c45d6738eb/wogalepikonaz.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/gezirelizedeza.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/19471727023.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/45563508372.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/tifebivosifarekabijigud.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/66038498347.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/biwiz.pdfIn PDF document text
    • http://clerus.hu/files/file/voxumoziwupolosaw.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/84885383075.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/pobodi.pdfIn PDF document text
    • http://www.polni.si/Images/files/zazijoveduvotewu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/696ed97b014f926ac80886278cd19a4c/76476203699.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/56700146395.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133b313db638---77862765175.pdfIn PDF document text
    • http://gazetavk.ru/img/file/nomirinarofikaw.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/pixogigag.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/64954862055.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/dadexufimonusenaxunigero.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d95964672cc07c5cdadc95b58dfb7a8e/4250271061.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc865e16b---berafugo.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xezawi.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/49639743323.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gerapuke.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/zubuteziz.pdfIn PDF document text
    • 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_off000154ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC4 10868 bytes
SHA-256: 9041317eb57377fa4b692310acf4ff75e5e54d3f7e65856183f8d3396d6b6d07
font_02_sfnt_off0001859e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1859E 18768 bytes
SHA-256: 84c81653ff318e3030136b321931a6017d8bfb4cebf529ebd7b3975da15b57d7

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