Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12f6818c8b60f24…

MALICIOUS

PDF

62.5 KB Created: 2021-09-06 20:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0353db640b637785317a4e90e21a9479 SHA-1: 933b09d5afd005802e16076a5e204dc8edf9484b SHA-256: d12f6818c8b60f24e933b1d789b49022d3bc23cb4361a6c97e9254e40da744ec
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier also flagged this PDF as malicious. The presence of multiple external URIs and link farm characteristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

Heuristics 4

  • 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
  • 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://synerhu.ru/uplcv?utm_term=peronismo+resumen+pdf PDF link annotation
    • http://bearings-home.com/userfiles/file/jolodaviba.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/96780307626.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1f29c6d0b166430f4138d878e4035a8e/padedotogowodisizosize.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/baf69fe6fbb0a37a200a7b19f6f1cff6/duzapozenu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1552e191cd---wowes.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/88046147499.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/12b7233e049055f063b16c038db79487/29169919345.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/cbe6312c39000da6a9541e5af7df7c40/53979644455.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/21109850453.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/79725802911.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/kezujobibukurewirizijege.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/334c4491692be1daa096a484417649e6/subotenexekugopa.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcdad08101b---10515312594.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/vikuboweki.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/17cf7fa156391349f7f0d80c334e9602/36284576944.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2fns0k2canb66rq81braliddgi/79767715656.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/90110481633.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/47633693870.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/xegukufaguduzekefoga.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a2126c8d737e7047cc6e3c9a5d5290de/binigizoroxaboloxe.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2a9ce57f---81351389316.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a32f1edcac1f00378126fb210439275f/xewazixajekipi.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5c81e00f782771545b9255162f2f3d51/42010436822.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB646 10456 bytes
SHA-256: 3f9d100127e01561b80b986208654e19089b3f4901cfa40b19a385da6d61a975
font_01_sfnt_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1