Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e7154f266ed887…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 14:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4f93f5a8be40f9d435a3352530f7854 SHA-1: 12e66235c0e86f763fdc2538bf6983235fa5be6b SHA-256: e4e7154f266ed887b83af7986f62ea7e97758315cc1fb86d7c7e2f5bed6882a4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farms hosted on compromised or disposable domains, suggesting it is designed to redirect users to malicious websites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=how+to+save+pdf+in+landscape PDF link annotation
    • http://4rrecycle.com/files/file/76835197631.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/27763374415.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7522c154bbe820a800a491fd756ac7bc/wiruxoguvak.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/46801739999.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/79901844992.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161471a68761b5---kejul.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/moputojofimar.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/soraluramokujuwa.pdfIn PDF document text
    • http://merwepizza.com/upload/file/juvexeg.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132daec5030b---leberuzugazafebuzide.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/gefile.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/bfab7f54c52e340821b7bafa367bcdca/40640661045.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109062007302789.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/werisomupeju.pdfIn PDF document text
    • http://santeh.md/img/files/75761138828.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/8deb025f18e45843a1e53faef9bdaf1c/58724894574.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/54143574677.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/befirekoxidarurutanev.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/17248108627.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/4948327278.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/52293019329.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/de2a2bac6c90ef8d0c4acd88e9b407fb/80998202444.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/vekoleririgumifumixowejuw.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/19179533260.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfe8b8477---miralizo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/23916455413.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_off0000bbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD5 10656 bytes
SHA-256: 914cf52a1d134f4b0c94dccd2d996b464edb6480e8b359207a05cc11566ae002
font_01_sfnt_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 15764 bytes
SHA-256: fff0f34e9978fecaa9ee1bd48f41f284013746c8e39ec6698c58f4db6a1c5425
font_02_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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