Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b33d23765da1524…

MALICIOUS

PDF

78.7 KB Created: 2021-08-15 20:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a739ef0579573398dd199a6cddddc233 SHA-1: afd461b5e69ac78d4837ae2a078aa0d10c5d44d1 SHA-256: 0b33d23765da1524e2e3558cdbe4b06561fa8fc09154c31322d8c0346231c505
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3bd213675---44143406016.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e475eb89c---41135706223.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6jnb40shlln6vgv2k30ghmj2j3/zajiwoniwagiwegomovitanak.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/dekukusizimo.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/puferegimazoxez.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160efd45f751a7---kaxesin.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/68113844393.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/46856308927.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/3222905145.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90b8c2f3bf---26067800766.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6ddc52a0---jixozazebizololejijez.pdfIn PDF document text
    • https://aspirans.com/files/file/66508051672.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/352b9ba9b3d538bd772233a5bcd01324/tokokimenexomuxodimopa.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/96744091842.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/74a38efc88394d8056649193d78f1865/jibesesanijowetakaxaxenop.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/sinivaximojox.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/pikile.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a99d4fc9d74---jalozanuzoxox.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/67574964152.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/21616892912.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/womisoxujogi.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210811_105218.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6e10de28---voririvoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=adjustment+programme+for+epson+l220PDF 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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 11204 bytes
SHA-256: 583c32ca8c0aa3b37f8fb5edf614b696b005af0ced9517026db519ca4fd6e272
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 16448 bytes
SHA-256: 6da12fde27444c289f2d52232b74373cb8396150d810cda3a254e1ca92ecc0bb
font_02_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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