Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9df26d4911bebe4…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 15:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5a7f2d2fe992769bca1018222829b07 SHA-1: d734fbee0d470216e8937f924a126a6d643dbd8f SHA-256: d9df26d4911bebe49547e9a8b41b0208bf1e499f617cd3f1a1cac4f8f36f79a9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and the nature of the hosting suggest an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=demon+slayer+live+wallpaper+pc PDF link annotation
    • https://chsins.tw/uploads/files/202109031102551994.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/10841961664.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/8067561881.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149201eae1a6---45495415349.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/90997058090.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/16357706426.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/39424480053.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/19905870137.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/13022d6970f3f86d797291a7f3de7b14/17540469246.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147a3d47a16a---nekaxawodesefumazarakus.pdfIn PDF document text
    • https://lordoptika.hu/files/files/sasonazaguzuluk.pdfIn PDF document text
    • https://hojoairport.com/images/file/gukuziwupapowa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/deralokafividako.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/51623549513.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/wanuvefirulilasixuper.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/sabudafofopikigiduwed.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/fixuduwanati.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2deb5b0cdd4e8d2658a5a450693dd07c/vajunefikifizakutigas.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/vaboxelarekuwujukoxizekax.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/luveboxudipebavuwezeku.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/figugoke.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210923213811.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/50274551415.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/13173162991.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_off0000b30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30C 14356 bytes
SHA-256: fa45383c0cc9db1f43bb6c7773532e8ec31226eb9cc0dcd0b28275c7ec8d5b0a
font_01_sfnt_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 10704 bytes
SHA-256: a486086e36c95690f76e4ae5814407914ea8afdceffa54489c14fdcb590a1028