Malicious PDF — malware analysis report

Static analysis result for SHA-256 46841e6767f0f59a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 12:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32978d8aa72cb5dcbb5d308e43dd504c SHA-1: f91ff247f280d69878ed9bfb2bf123aa55e94bae SHA-256: 46841e6767f0f59a090593a275de96f35a3f922132af263f8e80a06564eb3e96
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS uploads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bluetact.com/locktactyuma/userfiles/file/lusoduk.pdf In PDF document text
    • http://sns-russia.ru/userfiles/file/20928603573.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9351029f1---71625018172.pdfIn PDF document text
    • http://industra.sk/userfiles/file/91084921988.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/xazuv.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/60827204588.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ada70f8a---jusefomujojipifizug.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210905_8B266352C7734A7E.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/17845962970.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/padudanirex.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/tisobuvugapopojonafi.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/vizaxopuvofavubin.pdfIn PDF document text
    • http://metallpress.ru/files/24033274293.pdfIn PDF document text
    • http://kite-surf.sk/files/60429260239.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2e94416c80495d5f0591dafb00838e9f/zefumopiri.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/kunuwebenagokigi.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/21066171517.pdfIn PDF document text
    • https://atl-50.com/files/file/79498393782.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/52359419341.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/lopopakivameverunozigi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8771009ff---39420425837.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/28274359696.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/ferurejapavad.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/nipepad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gse+smart+iptv+torrentPDF 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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 17036 bytes
SHA-256: c6cf3e95a213e5cdcc6b91673e32b7bd0f54c56bcb02b4b8ca9e2a11f89a97f6
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 10472 bytes
SHA-256: 0137c186df86d899a446dd423501ca149d6f27a4f7195d944b285769ba27027d
font_02_sfnt_off000118be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1