Malicious PDF — malware analysis report

Static analysis result for SHA-256 194a3ed7b6a45515…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 06:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8692964e97a254647e19924f4f85835c SHA-1: 11698ae3c0c574bf268cbe48e5b268c105622251 SHA-256: 194a3ed7b6a45515da79a9e3eb87d6713ef5e8d113956280c33cbf26e7028f11
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised websites and disposable hosting, which in turn serve other PDFs. This suggests a multi-stage attack designed to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2226

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://tongchangkj.com/uploadfile/file///2021090810004710.pdf
    • http://marsalanoleggio.it/userfiles/files/wipiraped.pdf
    • http://hglobaltour.com/FileData/ckfinder/files/20210914_0A4466DF83B92629.pdf
    • http://wowbond.com/upload/Fckeditor/file/pinunulebalumafeta.pdf
    • https://girisimhaber.com/uploads/file/78889654438.pdf
    • http://areopag-group.ru/sites/default/files/uploads/kiwisukazovamolibodusefob.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/navijuzebuk.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16148fedd7e6f9---wupegapunaxezurukef.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/48445349206.pdf
    • http://abwfinlay.com/uploads/files/jigusefojalelezanomo.pdf
    • https://aglogistics-bo.net/userfiles/file/92265633245.pdf
    • http://starma.pl/files/file/86617170265.pdf
    • http://budohurtsa.pl/userfiles/file/banazonuj.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30397956650.pdf
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/povifurepi.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/4705280771.pdf
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/96320843439.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/knspc7bmta8pcl3l5j4o71ndg6/fujibinatipun.pdf
    • https://maviet.vn/upload/files/87934150961.pdf
    • http://erbamedica.org/userfiles/files/jasanezazewobawer.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41239ed65---37829821583.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210907/1043454432.pdf
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/50647591685.pdf
    • https://lrsinc.co/userfiles/file/nuxelasita.pdf
    • https://cfbadalona.net/ckdata/files/fanusuk.pdf
    • http://vyveva.eu/UserFiles/File/lizuvilotixosogotixiwasi.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16140afaa3e1c3---7447317395.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=outlook+android+activesync
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 16792 bytes
font_01_sfnt_off0000e50e.bin
ccaacee3daf61596b150b10c6d977fced810a3d4e94c0265b7fe8823cebf7e4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 23332 bytes