Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef0acc548fdb959…

MALICIOUS

PDF

72.0 KB Created: 2021-06-30 19:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ba87dae504714411437b2d221c06c1d3 SHA-1: bb9a22e9330d5c06a0ed999fe82932abf2301818 SHA-256: 8ef0acc548fdb959a9d07ffe04a791f8753c69e6713cc8b10531a6191663b909
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

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 https://cructi.ru/uplcv?utm_term=comprehensive+pharmacy+review+8th+edition+pdf+free+download PDF link annotation
    • http://pr-jam.com/ckfinder/userfiles/files/mojifusizerovuseli.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/potusamuzakigiz.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b738897da---jadixegid.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/walowoxofevukugolazaresa.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ad93a3e08---jovulovirireb.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1b5a23235---nusaso.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/18/file/minugufopitibo.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/xagivodelin.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ei8i3o5pm43q1jdtvt2nd3kak2/56826782171.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/vademodisavonu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/71361009666.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9883d3813---22462842294.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c51e2e993---74714612690.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ca491c73ce9aac670b6e008eba1bff0a/15298019519.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/59305184112.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/8332066613.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824b350cd88---zimubasozola.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c43110ebce8---xegexagekivajir.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608686a95bad4---rojukurizorugowape.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bf18eb6d---telulejivafatodofa.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_95A80D7CD62D5AD8.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8585343d---fawijirakokemuren.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/643e5f8419d55d58a1329a28b9b5ae36/73207887786.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 11392 bytes
SHA-256: 37c7041359692906f2c4745704e054a3a9d7178891536a1a42bb7ba99e603bc3
font_01_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 17332 bytes
SHA-256: da5885d341ae8d394cf21d82d7d229532911056cee574c9f7e79cf4e64fd0dac