Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6a3465499f44cb…

MALICIOUS

PDF

55.4 KB Created: 2021-09-11 07:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6a2e820e05b6b77f7c7b94b9edddb93 SHA-1: d41c4b407dc6d81430d1c7fa7543022b7e59c39d SHA-256: eb6a3465499f44cb5a00a6398758cb3067d65589968981acdfffcf77e00bac41
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for link farming, likely to obscure the ultimate destination of the malicious payload. The presence of these links suggests an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6648

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://deesudcoolingtower.com/userfiles/file/betedel.pdf In PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/40897226028.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ffece104---gepidirobitipol.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/69024376493.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcead0ef01---sosupejat.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/jupunedudifezedigozebim.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/tigisapawofifabined.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/59604625905.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/10800645109.pdfIn PDF document text
    • http://espokebar.com/uploads/files/fufezofota.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/vagoxasewodesuk.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/96689107208.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/8785152605.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/10669466302.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a9728303e---josadiwupid.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/7249559901.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/70431319889.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/wokolugasexixepudab.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/bawirixuwib.pdfIn PDF document text
    • http://otczenacts.com/media/files/1154513787.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/sadazetoboju.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/40042161568.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/voraseki.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0b9b7713---butedumevivi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/06057fd622ee7ff9a5065298be889079/16638227118.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/6039430265.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139987d0fc57---xokepazobekexudusobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=friv+garfield+2PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1