Malicious PDF — malware analysis report

Static analysis result for SHA-256 1963dee32c1bb676…

MALICIOUS

PDF

84.8 KB Created: 2021-06-09 06:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d4e342b2770a5b8ccf3b5b6104b5b738 SHA-1: c6fb0196a985388c5c9ea9d3e7dab7a6eb85b0ff SHA-256: 1963dee32c1bb67640d2e0930cb5c9b77a288a4393827ae1821f8a77c53aa3ca
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7040

Heuristics 4

  • 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
  • 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://infrive.ru/uplcv?utm_term=dj+afro+fast+and+furious+9 PDF link annotation
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c6d1798763a973854d4b9e56ef68e18e/49058422488.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7gmsuf1m5qj16kq8ql9mqiiibn/81480132542.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607183b5ddc72---bibizijamitigotajatilotu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/fcn62cnqn3gd5d81cgu4j5ltis/79974786193.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kelonurejegupazut.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607578d622937---99855026781.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad39b87574---63616727903.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/f6q97536545ivoq8ulvu7bds4h/naginepo.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/90aibcl2pomu4e0d970n6t4iu1/gigipelanexivufurufemagox.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8819bc3cc0f778c4e7d6fc88b5a6e20c/nejatikixit.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928854756d0---7692208826.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/47948252715.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fc7353671c715383b62c22c017d56bb2/linuwupid.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d950126ed7---45983797508.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/zofajadu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2u28nrt5esm81pjg8ovcp0561f/50274063478.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3d6e584e1d13a986b2efbe9a595909b4/65909209540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 5100 bytes
SHA-256: efd3ebd4ccecb4b7ff1dee9d7497712f3b26b69758e6e3c47fd613e30927d569
font_01_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 8844 bytes
SHA-256: d10e505b52e5717a324f4479173036c51425a9d0d0a830ea9646368d9b4ce08f
font_02_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 12972 bytes
SHA-256: 8918f18c7ba3ebbed1ef97ac50c0e9f125c46e6d098b3f5c3fd91d4a314b53ac

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