Malicious PDF — malware analysis report

Static analysis result for SHA-256 39907cff6934d75e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 19:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e610caccbde8c06c4586ae6757af702 SHA-1: c48943097e928758aa42f7a33cf6c9570a69077f SHA-256: 39907cff6934d75ee0577c41c0d2fa5494ef4babbd2f77d2297988b555126065
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of numerous unknown URLs suggests a potential for hosting malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cdwy028.com/uploadfile/file/20210807110042.pdf In PDF document text
    • http://all-pass.com/folder/editor/file/sakaf.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a25e2e3c---92297232214.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/20283567881.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/83278870280.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610defbb50900---29993142108.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/vakavegagoran.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/rifunonesorixoxuwub.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf46068cb---64549646427.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kakjdn1sgd8m22uk75ehocq7ot/pagazumiraretivavix.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161066553bb924---81542445143.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/wugoluxaxesofebemazunixeg.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ed8a2ba477d78a88fa7ac8b99f8ba936/68725308759.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/14190388078.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/notapagunazumok.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160f70cccaec8c---mepuzosomog.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/e8gp3f9pro9a6kh4tc4nrse0n2/61275255457.pdfIn PDF document text
    • http://santeh.md/img/files/favupitepumesanunosi.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/wewijexikokumojap.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/19023787396.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/4435689664.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/16486816098.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/04d91b75c24ddea709cc446d45deddbe/rutes.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89d3b7439---36064573973.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f460090d10---77133028578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=angeles+y+demonios+pdf+descargar+gratisPDF 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_off0000c13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 17996 bytes
SHA-256: a05b4f0dd9c8218ddaea18e6ce8cba4d4029fda80e3bdca0aadbafb3ee543f08
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 11056 bytes
SHA-256: 4ccbe6f782b630994aaf0adf65339cd0a4cfa6723deb91d5adb2b50cfb9fa6ac

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