Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c920221b38445f…

MALICIOUS

PDF

90.1 KB Created: 2021-09-19 00:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf743683c8ea4478708947b194d4b1ba SHA-1: 68f5d9820de9cd3813f427948c38cc9a857f106b SHA-256: e5c920221b38445f904f153b3e1b5d58f7d0c5f0aecafe204c63a9f7d4c58cd1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The presence of multiple external URIs and links to compromised CMS uploads suggests an attempt to redirect users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=kimetsu+no+yaiba+movie+infinity+train PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c31b4ccec99b51d934cbe2eba0a3fe0a/24777861818.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/82070468288.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xebubokoborejufa.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/dedewubuxidoxidejuja.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/balazuginenugozito.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/pimuvagosoruwo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa722a021d---70982459150.pdfIn PDF document text
    • http://rayer.cn/d/files/vesanireluvojava.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138277a36d0c---55903834452.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387f24373ad---vofike.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/32338625206.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/soxedavinefeb.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/61033398280.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109131749521159.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xuziwakuziwisomogof.pdfIn PDF document text
    • http://arablift.net/userfiles/file/nuxaj.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/52194783452.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/tedawubimopizejiximumibem.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fdaf4def2---53172179111.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/korofulimamafelujug.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/nokazinojowizetezumuna.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/dasovopitexasisebewa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7c0823da---nixabasaxejiluguteguwe.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/58598390453.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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 21144 bytes
SHA-256: 0ae2fc196cf49cda449a06a388812dc22028fb6b6da26727642a5322990a80dd
font_01_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 10740 bytes
SHA-256: c703ea1475cd59233e187474de4e4fcf28441977ff2cd5f11ac9ebe9196f3d31
font_02_sfnt_off00014257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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