Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb803e877a3faf9…

MALICIOUS

PDF

97.1 KB Created: 2021-07-18 09:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53b09368002ab4b5651e113c8861f163 SHA-1: 6f21cb307f49268fb16553f5c1185e7879bbb487 SHA-256: ecb803e877a3faf916c28ce1d6ec0b97c504ee02390df5972822775be9f199a8
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 WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate this document functions as a link farm. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://mnlex.it/file/8203838446.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729dff7d0fd---julinuveduluzexunuko.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/j94hq1116k5gkl0q5eqavcela1/pukofukinez.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607372699879b---41155650022.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/1deeg2hip5ikhm6qtfegqdtltq/serozar.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d3ea707f---51770693234.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160867b8761d78---43414580532.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/tefejudijexujibuxizideb.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/lagozamukosetirevape.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f8d84d39---83885134113.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/jemitafuxanojuxefix.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2b8de5af74c8c5fb0c29d5265232af15/37082481976.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8c0619337ce9322ebc0771fa5b7eb36d/25643841275.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418fd204c0---80063633825.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/letizuxovitogudute.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/89893945767.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/nituronojafuf.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072676ea7c99---govuzapowewelovadu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/54a1d7d848d723e75fe66f4837f860f4/32917308639.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nkkn5efidl4mpafd4bqvcueoq4/91134596453.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/55633885000.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f3nt70khfvc5nuevvedgoaq3n5/subito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=believer%27s+bible+commentary+william+macdonald+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015736.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15736 18884 bytes
SHA-256: a98bf76e4b4a793676ec7ab3a73d9bc70dde779687ab3a3b4a05c992fca6277f
font_00_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 11276 bytes
SHA-256: a2c8f5b32e058513daf83d652fb4eee6988256401fd1ebbfa60911e19f5a00d9
font_02_sfnt_off00012a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A89 17136 bytes
SHA-256: 394f38c42b8d074ba99fe1d409d05113aefa1e71147be6277587f56617a8ab0c

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