Malicious PDF — malware analysis report

Static analysis result for SHA-256 5966a8ac5c51ac69…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 23:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fa1b2872fd76f58959b4b6c8fdafdd60 SHA-1: e9ae1e7f742747be29d5c51e20943dc00247a54e SHA-256: 5966a8ac5c51ac6949fc9f08ebed413fcd423a55df1704a8e0ba58cceb1e369d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct users to potentially harmful content. No scripts were extracted, but the structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/81c76e2577ec0d8d90c277775890245a/36947310800.pdf In PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/15274697606.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/30552845026.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/12645008522.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42e15479aa---dodipezolewenaxobe.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/64152453970.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d75a0b59c---33637920159.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/34904129499.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/46784866932.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/nobegefubi.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/mupukusesubenonawalem.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160acf648f2c57---peliranabuzefuzuxevitazo.pdfIn PDF document text
    • http://petrduchek.com/files/40254824405.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6c1e7cc9f---zivanoxogadevogani.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/cfsu977rje3hinlmrtvra6aehl/pukuxonosasevuduwep.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/72401213755.pdfIn PDF document text
    • http://eko-uklid.com/files/file/74550981196.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/bitomasodololaj.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdca0e5b0d---mefitun.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cf7c8321---46674243241.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/78c140e12595598fad81f66df3c05e40/2503182897.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/tubuwagimaxubobed.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160709375923d8---lanasateko.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bcab455fb7---84438019870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=adding+worksheets+2nd+gradePDF 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_off0000bdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCB 15172 bytes
SHA-256: e2fd8a17e4649040398b0a36d9dbcd86e56c39c76d89a6d91deb263465da54e0
font_01_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 10760 bytes
SHA-256: 6f24bba5b310ca3e962b41f8241b0aa4ffaeb3f921301d604c21c1381cb0a380
font_02_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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