Malicious PDF — malware analysis report

Static analysis result for SHA-256 01972fe2140c9533…

MALICIOUS

PDF

86.6 KB Created: 2021-07-24 05:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac0d934ad0e74acb7229131e5b44ba29 SHA-1: 8d22b9110bbed7e94834c8416a4840a327dcbfd9 SHA-256: 01972fe2140c953399bc526efcb9dde69e5fce42ec54f5c0f1efa24584534488
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ML classifier strongly indicates maliciousness, and the overall structure points towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a56c1d075---37753822084.pdf In PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/osg5ggi7m0c8oov5vpqt0k8e5m/zimuzuxepivufuwobipurep.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/17597214132.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/22680943571.pdfIn PDF document text
    • http://yulintimber.cn/d/files/29485494552.pdfIn PDF document text
    • https://limsurempat.com/contents//files/lowaxamupiviv.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/vuwavegorul.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/74322103838.pdfIn PDF document text
    • http://carszana.com/image/upload/File/zuxawegegaworava.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/bfe49c3515af47665a770d0926d466b7/74191857717.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/wuribukajejosobeke.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/rowiluv.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/2481078570.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/xesomugawikunapibibozitu.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/foxarewakenujerixenawug.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210611072527_b4ex5a.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/43443105859.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db780aca625---kusuv.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e682155ac1---7360388200.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/13496713277.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab679f3ada6---wugevaxumovigu.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/fonuwa.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2d0bb2ba9ed88764948d127fd625e07b/67978849355.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/49486967149.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/kofixezuzuvewaroxetuxakuz.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b91b9558a---natifumefodoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=full+form+of+cmdaPDF 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_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 10120 bytes
SHA-256: e8f9e5a8d9afad74a6b7887eb17dd009d87042e3f24c67ff14506abea775ae3d
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 18236 bytes
SHA-256: dd89eea2f8619d58763cf2a40683ce86e26e73c34426afbfb4a2e9aa0e26ba73
font_02_sfnt_off000134de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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