Malicious PDF — malware analysis report

Static analysis result for SHA-256 d630c6a1c0356e7c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 19:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 571ef1d6444b6c7148f83849b3e975c2 SHA-1: 20ba0bc4570d7f9c6fdfe40cdbfe6e152915e624 SHA-256: d630c6a1c0356e7c12fa447b864d72bc1cb3a52ce0e726422d88c3d678ac7f5b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The 'ML_NYX_PDF_MALICIOUS' heuristic firing with a high confidence score further supports the malicious nature of this document. The presence of embedded URLs and the overall structure suggest an attempt to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=install+filelinked+on+android+tv PDF link annotation
    • http://hiro-seiko.com/upload/files/64591833702.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/dovalapojibu.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908144935.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/zulimawagukova.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/kowevujef.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fopojegofokefedalive.pdfIn PDF document text
    • http://ccsl.asia/files/93794173641.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/kilobiwufeguzewoxona.pdfIn PDF document text
    • http://amdind.com/userfiles/file/36162657878.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/vogolunefovazubitowuxe.pdfIn PDF document text
    • http://zubrcup.by/files/files/bubobasamisudapivana.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/91946351578.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/numazobawado.pdfIn PDF document text
    • https://12waktu.com/contents/files/41342362252.pdfIn PDF document text
    • http://greenglobepms.com/uploads/84724742217.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc7fdba7e---kufemokejawudokufosisatan.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/25807746232.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/817af1b1626973a9393e02fe819fe91d/76224159791.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/86984674893.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/62830277675.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/lazasejodubol.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/zafavomosurisuxujanamako.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qvev80gn5p3fktqirr0b16qjat/zarewisaj.pdfIn PDF document text
    • https://petikdaun.com/contents/files/gofavikewaniweja.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/93865223510.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_off0000c05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05B 16488 bytes
SHA-256: 04f13a12a6838709717560b96eff235b4e390cb9e3be5606b1b5f500e4fb5278
font_01_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 10456 bytes
SHA-256: 34c64e9336e1c879e494959fe9324a49d1cc29fd668026cf7340a48a4ff536ea
font_02_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1