Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b15ea72029bb8c4…

MALICIOUS

PDF

92.0 KB Created: 2021-09-13 06:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c823f19b270cac4332c2427f4f2cd59d SHA-1: c2f052e8b408d876d8296e39a822c1327214998b SHA-256: 9b15ea72029bb8c434845723bad2ceb7dff390caedf3e4228680e3ae277f0b5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. Heuristics indicate the PDF is a link farm on disposable hosting and points to compromised CMS upload storage. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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
  • 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 http://www.pattyn360.com/upload/forum/files/xojojimegetorixujudavum.pdf In PDF document text
    • https://peoplehelppeople.net/uploads/File/wumidopoxi.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/juxibiromupam.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/zimomosiwigosinelimigis.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/mukusibetokawazus.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/namimezusinemeromunuduwet.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/47614762056.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbfb22399f---worixegobajezenam.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/gibaka.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613b87e235b84---gawowanasetezopufijub.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/menoroletu.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/92362478773.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e6eb8b00a5f5844623ee1306db6954ff/71114251090.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/94692389604.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/84363817199.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68682414061.pdfIn PDF document text
    • http://grupophi.es/uploads/files/diromexupaxuvasosuna.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/tavedomifa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6840f47b2efd4dcbb418962f85ebaed/54929839606.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/faxokol.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/74790826606.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/mibivekotaw.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/vevanep.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/72533302730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+careers+indiaPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/42092487210.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_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 18452 bytes
SHA-256: 2ca8cd55e98977d5629d536b62088632c0202c86b191036d84c8cd66e955924b
font_01_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 10200 bytes
SHA-256: 02762f5de8c178643556f438792773b82b6cac82f6b23bced807b5bbdf559fb0
font_02_sfnt_off000149f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1