Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c79542bfe0813a0…

MALICIOUS

PDF

90.7 KB Created: 2021-07-31 02:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e255f91132c9115a307c6a6cc6d78b7e SHA-1: ff516c2fd16895a1bc4c51936bbe656a78769507 SHA-256: 7c79542bfe0813a0e07ce1ebfc9bcec65ababf43400a969d95129ff1e1f18846
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=what+is+independent+and+dependent+variable+difference PDF link annotation
    • https://amatnieks.com/pictures/image/69819344636.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/norowizox.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/11048235177.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160905373e88bf---larotiruzodiwaronupu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/af9f002302be7ae9c3afa996da72f31b/32260463756.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/sufojuluvuxobaluwavusox.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/84130112705.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/5d97snp0aem7tjt430bjincgi0/pigudenu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070635be5211---63058064667.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab968009f49---zupatixovokusudibizani.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/47529033219.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/66794893963.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/kagunegeretavutunosogasu.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/sotipuji.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5d8f38955f85555686f879e457c9a91d/wixuxupolu.pdfIn PDF document text
    • https://motacademy.it/file/wonulaxaleta.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/87342495958.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/72335498277.pdfIn PDF document text
    • https://combrooncom.com/contents//files/xijumojurobusiwolosuxemi.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/81580697138.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e68b274489987779477f6c53b3e1d714/79105243762.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/55063843737.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52cf2da327d3cc1018d861f22813a91b/36818868860.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/69026832004.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_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 10796 bytes
SHA-256: 1e24b50693bf0f136dfc620790a198f425261cb706349aec10528c8a313e5719
font_01_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 17560 bytes
SHA-256: b7a1b15e7a7296e809db3cb62cef4e6c78873d9382438bf005409511f4944608
font_02_sfnt_off00014431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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