Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d5f0780922417d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-09 13:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f377035a3e23bd0f2e624d8810200621 SHA-1: c50517d4b0579131b40b0741910a88e9f1a4f783 SHA-256: 66d5f0780922417d25938c44f1c28c67e9c952dfada040dfb4041dbf782e4914
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=downton+abbey+film+streaming PDF link annotation
    • https://hsdinstruments.nl/uploads/files/92737316522.pdfIn PDF document text
    • https://patc.fr/imagesfile/41410238910.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gupumanakekezaxuji.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/74429884137.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/36178277805.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/lajurisevulukiwusadapu.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/5814256168.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/95fb27639a0909d4930021c1abd4f3a7/xefasivawon.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/49442636748.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b879f695---28428671474.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613897887f393---ripazixopabelajakat.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/kenonilimen.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuguxobinaverabog.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/zalixonide.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/03oi696080um2o9eh8ri20vot9/82431017668.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/66695024917.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b99c6fb0---69474850882.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/85394855216.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131afb3afab2---42981102617.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/58598390453.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae16752db---buselasezopugifebuki.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/bapezesusejijugulowowa.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/84947874002.pdfIn 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://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_off0000bfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB5 10900 bytes
SHA-256: 6448f70e392ea70312933f04b1e43a84d57eecf36f4f9c5bb80455f2f38cd69e
font_01_sfnt_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 16916 bytes
SHA-256: a5ae9fe560a9501d1c8fde049f209a9b20e7400bca66b7d0e44a11807f7e4761