Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2db2635b62c171e…

MALICIOUS

PDF

82.1 KB Created: 2021-06-20 11:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: bf79514ede66dcf36fd912a3c9a8d520 SHA-1: c3d1a4ab8a2c9bc18ab890c102b01bb7bc9c27a8 SHA-256: e2db2635b62c171e9c98ca0d316c558336f0deb0cd76374386df7ad5bb24c900
64 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. 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 suspicious score 0.4970

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3813dd69---23308792384.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e6372fa1---59692581875.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8c07826effec9be6132b6160de830720/xaputifet.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7atgdu8vcmrn9mp4nb6dqanfu1/59412455833.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/bebowadizoxare.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab920a34e40---purizugo.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/nupelumipidedet.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/27513216034ddbe78beca88e2aabe0bd/59927519954.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ag0tlb71p0s0ehfu07trr2ne2/rizuduzebafekadoserifiwe.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af52e9d1b3b---kanix.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/l7s83k5j6kbrcad9i1kqvhvko5/mamiloniza.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/58262480438.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad396c13ab8---jaxuxajon.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/df8e6d2b0c3e9bc043a557cefd0a40be/52584289619.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/da4105522830ae078209aff91d0874cc/xojegupifekebukorele.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f1b512471---bimop.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/v3s8tdn80h1sau7abu5d3ttpp2/47359153431.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/39026472718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=namal+novel+offlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000112f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112F0 28328 bytes
SHA-256: a587db9abbfd55a243e9b04bd37eb97c206bf54b50a69c6c211909c3e4313d28
font_00_sfnt_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 4668 bytes
SHA-256: e89e72cd4cb3e65b14a617935594624f61f31c590b11dcf24c5193708014586c
font_01_sfnt_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 11448 bytes
SHA-256: 1398a1dc86b5a9009f5504ac4b2e0713bf24f99e1989b4991a883892d6e5463d

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