Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b4b62696398898…

MALICIOUS

PDF

80.4 KB Created: 2021-06-09 05:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a33b29ad49c779803128e093b9ea1fa3 SHA-1: 0552fa2d9da989c170880d1b5b4ebaef39971711 SHA-256: 24b4b62696398898b454cdba369b0ba9404772062eae3273ac6ffaf847d21549
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for SEO manipulation or phishing. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=habibie+ainun+2+full+movie+indoxxi PDF link annotation
    • http://all-pass.com/folder/editor/file/zepixazufafisibixelop.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160771693086f9---gavobunakukonu.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/24890487254.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/677ee01f7f11989e04ca7fec029f5d12/vumepaserekaduma.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/35412384138.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/60793238999.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/47209676644.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160773a88432cf---tazoxifa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qh3epqolrru800kgjn2c9j2381/walovumitotovokip.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6dfe4b7e---kemaji.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/10379123772.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaae11c5ff---batagu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/43502162165.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/22771132322.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5140 bytes
SHA-256: 19baac0eda4a0868b018e32f79d22081f19084d80b8facd8b306b36a73ae6421
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 10884 bytes
SHA-256: 7a9ae32c9b7381b1b59d5902e9a8c353c7305b948d957c825466910dea5d35c9
font_02_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 16208 bytes
SHA-256: f76e53b1165c770ea72ceccb5e808e1d48d2b426d0b5e274530350a00bad707e

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