Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bd745dd0fe36b3…

MALICIOUS

PDF

83.2 KB Created: 2021-08-29 22:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23bc96dc35957b4775e88b6ce7865412 SHA-1: 6f9e24261865c2173c289ad99a1a0b0c7ca46e62 SHA-256: 72bd745dd0fe36b343d3d87cefa6ac17f4b92d76c5e3e837ae8d50e8bdc56d3c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it likely contains an exploit. The heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress uploads, suggesting an attempt to redirect users to malicious content or exploit vulnerabilities. The primary IOC is the compromised WordPress URL, which likely serves as a staging point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5f8969e1e3834edbf2b3bcab5aa14ac8/ginoxeferonububilusa.pdf In PDF document text
    • http://knuhpharm.kr/userfiles/file/20210801155256.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/77323571844.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/susezemodugiv.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/31043114745.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ac85d80d2---fesutipitu.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/9122480532.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed573c51df---pobazodegevotutabowezer.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858271c2b84---6122639699.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe68df5c45e---dezaruwisiw.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2502e5cc4---68950860003.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/vezupinofatebisoladimage.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/fitufaf.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4adf1b75---xefedabo.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/89499367199.pdfIn PDF document text
    • http://hanleyresources.com/images/22427962349.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/47993295309.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160857729a381c---5348451357.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/33649591995.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jijizip.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/larebonanu.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210604114315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=scout+games+for+small+groupsPDF 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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 17468 bytes
SHA-256: 80fbe10495ea99948803c5a3981c6f72900830591d47fe056e28c750f8531493
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 10804 bytes
SHA-256: 8c3e95d45829f39884f43c83e147c143fe9de09cc34288e6ee1e793326a02ad9

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