Malicious PDF — malware analysis report

Static analysis result for SHA-256 e327cfc52c3254fa…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 20:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4f78a9497f132d7d155d309c1155194 SHA-1: 6541939c4287c4468466b92dbf6000c61de509fa SHA-256: e327cfc52c3254fa12e9ed2a3f42d77b257bdb055ef6a58f62b4626e8d900701
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm structure indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://tsydesign.com/userfiles/jws/files/49243089978.pdf In PDF document text
    • https://motoralbini.it/files/file/wulivebula.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab534c9cb---rexeguzesedegixovitun.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/81059797450.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ojjed78d46ivs90mafbd96v6o2/sevot.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/giwivakixinexuxifuzel.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/felijipo.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/dilavonela.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///86747519507.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/vowaruzubofebegijemibo.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/munijivoxokesuluri.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/35778753596.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97524225204.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sijume.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb5440df54---78026617600.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/wezedowarusa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/feccd616fb0400adabee1ca0711fb274/wesozom.pdfIn PDF document text
    • http://alcantara.cz/data/file/rixijujegofuxokotepar.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/0853ec.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/wiwejikexuk.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/kibesapezuvunatenenapit.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/siwigumagojuk.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/5130328563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=virtual+family+2+apk+modPDF 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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 17728 bytes
SHA-256: faf484e93becf8b67d82c8e2e9918675dcc4a45902c523c6ae4cd28b5e608bdc
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 10648 bytes
SHA-256: c86b5b2e4707724eaa49c855d7252edb8d7cf6ebe6a6422a13eaed1c3e580d9a

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