Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fb4e1423e48ed1…

MALICIOUS

PDF

99.9 KB Created: 2021-09-04 19:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 61d99d2ebd7d01f20b08fad5a065f164 SHA-1: 02350aa44b2f2f0fd8e14ca5392b4c59e8d48319 SHA-256: e8fb4e1423e48ed17484567640a37f04fd7ec77cd29651ffd5856f5f446a0b05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://sampoernastrategic.com/uploads/image/files/jatarewapesa.pdf In PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/jeselejo.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/21202675936.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5283d1e4e---jujotug.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111083d0f599---62531310969.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xusudamuwenavoneripagux.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a716f20a---roxatuzurumopagonex.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/p26jn5uaojpa9tso7gknsf8p9l/pasonudiruzigolulesuneg.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/naluxezewuga.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/35352767511.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/28511642045.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a8537c60---85565458267.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/80259665575.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/48535641723.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/nadufabokujedageg.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/65588321074.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115475fd8895---92487027826.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/ziziganoxul.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/digavab.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/33611965696.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/78102253324.pdfIn PDF document text
    • https://fratellifurloni.it/file/44609548167.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/32049802035.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/vubanuwul.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/sudoxagizinaxagufuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ethnography+sociology+pdfPDF 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_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 19360 bytes
SHA-256: 77080133f4936a2df2548a9477247c6136688c29c526c1185afb4472e2f90f73
font_01_sfnt_off000150d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D4 10864 bytes
SHA-256: 267bf558d4ed867d4687e1356ee7638e4be67d8e5ba45a85c2f88b6f02353efd
font_02_sfnt_off000169ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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