Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef359d8a23750641…

MALICIOUS

PDF

79.7 KB Created: 2021-08-30 21:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a6e53937a7a74a416b16f47f5def25e SHA-1: 362821d7c271937d157484b8a56044a1ee924353 SHA-256: ef359d8a23750641b38f178f7b4b20c8eee7227779ca1ff04e0e99aab9b182c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or facilitate phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5802

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cc3887597---vomotajavuwe.pdf In PDF document text
    • http://moestuinwebshop.nl/userfiles/file/tovazo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f164b8e1---19993127331.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f9b2a81a---2140248133.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/rirogipovavapanukosu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/969b9532ff5a73444ecac5eae2d33a74/refozuf.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4807ee7faf---radebuvujafevoro.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3f47d024aaaa14f88dddd6e201ad4ed1/tuxiwidofez.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862636eda8d---zawodopedu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7a3b465bd2c7ff23a0a4ed82ce5e6e19/funanumetedujibigi.pdfIn PDF document text
    • http://nietegeleuve.nl/cms/files/matufikakesixaxuwu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c734d194b9---59604341199.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/10649102588.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/72204168834.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0d2bae51998fdf5e93e964cd5109d9da/83596238987.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ef7cb9b0a576f10f053ebbc6975bffe/53339458604.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/wirizoxitudimudonulezog.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/fidoroneleponixeg.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e21027aaf3f---21111035689.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/904838c4cde3510e2ccb12c506dcc958/66651462573.pdfIn PDF document text
    • https://recrut.com/files/files/11410849134.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ehdljh0j1jfc9ec8hgl0p6ir9g/87176272288.pdfIn PDF document text
    • http://stonebreaker.at/vudotinuxu.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/47613622656.pdfIn PDF document text
    • http://khocabien.com/uploads/files/bezuxofawo.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/26688118800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=waste+recycling+near+mePDF link annotation
    • 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_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 10560 bytes
SHA-256: 5901e077994bd111cc9d28c33dc6a110411ae4a85ad9ede19cf0940127c0ae09
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 17764 bytes
SHA-256: 60fdb32589a93b40263b0314a9b25c090c7491cefa0587a58c75d769c15862a4