Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ee841ea49a322b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 04:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9143a71c0eaaae2b2eadd441c715f848 SHA-1: 0366502b70aca12906ab8deca8f3ceb82948b486 SHA-256: d4ee841ea49a322b281d842edae53294940cc1e66b527cdf9890e9db8cb1e60b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates a typical phishing shape where a screenshot hides a button to launch an attacker URL. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=how+to+get+obb+files+on+android PDF link annotation
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/xedekosanoguj.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/26276466683.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/guwupewe.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/binoge.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/bifabuzefikoma.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/dabukorimanir.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/56609085841.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/96157901527.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/timapab.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/dokepalotifibisitirapid.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421939b4e06---gigavuwozideg.pdfIn PDF document text
    • http://tinhotsaigon.com/uploads/files/wadelukaxifarefozilob.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/87095378346.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137069a2d588---rakuzo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146d540a98e7---bofozisazurofivowowexo.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/bigolitifututifeg.pdfIn PDF document text
    • https://clove7.com/userfiles/file/lakun.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/57917913094.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/39036846409.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/nejereravadapozesux.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/33383530023.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae9252c1b9---gekilomabimepodepawijov.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_off0000b168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 10744 bytes
SHA-256: f095b8ce344fa1ed24cc726e3fa8d4cb0d86631ac3ac9147846b80bc7ded28ac
font_02_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 14200 bytes
SHA-256: dfe610fefc23ac490f4c58f85c6ceec4532be66fe5b42d3f50092eb286e9f98c

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