Malicious PDF — malware analysis report

Static analysis result for SHA-256 681a333a5fd7591c…

MALICIOUS

PDF

93.7 KB Created: 2021-06-10 19:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f62f79c25cc3312387fb764c04a5bada SHA-1: a0bf39ec76db5040a2236a3e0ddf2e77bc6d048d SHA-256: 681a333a5fd7591c645f653ab559691103f4a5eebfde26335093c8d503a70386
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=download+song+bol+do+na+zara+mp3 PDF link annotation
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/c6ee718a8e62962aba8e9664bdbc9448/wazoxerobodozeke.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/63906748788.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8a3f5468f45580ea1b07e6d8def70b8e/falupesomewumozajorutavo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f69a999d6---mowafenedifutib.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086e420552ff---42431001464.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071bfc1f106e---misav.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce16f73063---debofubajegerogidubixux.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3473466e---40725343661.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ad65927320ee47b8d4746d55a1672e9a/wunikojobesagiwon.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/56751fcfd3f24f6fb9fdcb6edcdd3ffb/96107343828.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/79549591883.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/46150026230.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b8d275022---57732549759.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/voropejasuje.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/46696656934.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ce190m7s8e9eaud0244ml8hn57/82610153766.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/11923672801.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://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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 5796 bytes
SHA-256: c2b64fa802e7bb3fef083d5cb69599f69d6ea9db940418bcf02d35bc10cdf03d
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 5724 bytes
SHA-256: f10afb30fcb331d755fb1f2dbd2b9cee1c577bfe25b58c7c3356787147b5f5bf
font_02_sfnt_off0001133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 6908 bytes
SHA-256: 3ff02e1272eeb1abd39ba5c4e49617895ee904270040cfed26603047f78c77d2
font_03_sfnt_off000125e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E1 11520 bytes
SHA-256: 02f8d6f274f77755b1cf5e7e396a656d2240ed675b48acb9a43786b4735c76ff
font_04_sfnt_off00014d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D61 17428 bytes
SHA-256: 101714245d55df7aa4d035aaf4b031ab0d4c8728811ec0c8c5e2db18258c0ec3

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