Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae78f0d48fac738…

MALICIOUS

PDF

90.6 KB Created: 2021-10-05 20:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 521701d344c727e4c032be0e6a8b2ae1 SHA-1: 52b1014ba3230af6db32ce5106351f85d9cd1b30 SHA-256: 9ae78f0d48fac7386494f7b42d78afbaa112c818801b62cf813b36025802c2e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://liceoadultos.juniorcollege.cl/userfiles/files/26642597579.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0430c4df---93603676807.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/873d5f270b39b94818fe0c060c621cbf/ginokonoxipuzunisuri.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614783be8b37b---ruxiwapigisetatudako.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/58444663101.pdfIn PDF document text
    • http://master-vin.ru/files/file/76336492054.pdfIn PDF document text
    • https://edgecs.com/documents/jenegule.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///97755905335.pdfIn PDF document text
    • https://clove7.com/userfiles/file/gawadabokar.pdfIn PDF document text
    • http://newcompanyindia.com/admin/userfiles/file/poxirelifezuzutodasi.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/67200737424.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/walewuzolixivozokuladus.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/boxirib.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/99998386206.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf475e203---guwawukudovepelanafuz.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/pumefiluzogamemuweg.pdfIn PDF document text
    • https://melz-feu.ru/upload/xexaxiwad.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/82159089306.pdfIn PDF document text
    • https://superpart.com/files/tavonufotela.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3568a59e---fujesirofamugenemiv.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/96315857794.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/16098997794.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/57762560572.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631329552_1.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/neredusigaremitor.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/vinefukuson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=examples+of+cronyismPDF 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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 10740 bytes
SHA-256: be7f2be839d51b56abdfd7e982116cce33c029cae42025dd89c7d7dfd26b9c72
font_02_sfnt_off000124d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 22128 bytes
SHA-256: a5c8c5559cfd5659406b5c5ca3499b78cfa608d510e1b74a74a176cc715ead14

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