Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1d7dc1e9532802…

MALICIOUS

PDF

88.8 KB Created: 2021-09-09 13:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed0ba01991835770eace1e4917380551 SHA-1: b7a3a2522ac49c0f91bcc6c793925c9b32fda109 SHA-256: df1d7dc1e95328026125f9ab2d06cfacc15a9f5199b84e1d53f0445a99b270dd
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it contains a link farm pointing to potentially compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902110322.pdf In PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/33804875039.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/35119418303.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/vomuzexenekor.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/86640217175.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_191837.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/611c7c9bd58ef4e68981d347acf14526/89284260482.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2875ae280846c7d4fa8249d6f5f88ffb/ferevumowakivofixu.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/sisawabexazalijexawaxubu.pdfIn PDF document text
    • http://fitviewer.de/files/file/xivodojosototibowazumu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/66228796983.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19245685873.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tevipubovubakawu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4f6429dfd29660793c407f0a91db0e50/93090944106.pdfIn PDF document text
    • http://humanlitech.com/files/files/titofobefezenorogakir.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22751789c---wozirivomotukize.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/11466677087.pdfIn PDF document text
    • http://186086.com/upload/files/lafedelud.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/73588654736.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/9822900689.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49045783567.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/fofozigejolirageganebu.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/78417734956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=app+soldi+infiniti+giochi+androidPDF link annotation
    • 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_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 10748 bytes
SHA-256: fc352273b44bd635ecd58d829e0668594e7e0482241854ef8b85241464562546
font_01_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 18456 bytes
SHA-256: d0e678d22442738095742e3492196ea8964fb90f1f2cdf0808293fd2e6cf4420