Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ce11128471db1f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 03:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01b2f11ff68f3447de656b38e83abeb0 SHA-1: 38d55f59d4ee354ad97428a0070b330ef97d8c91 SHA-256: e4ce11128471db1ff25fb10162e0611321049293478581e65d1f4133b64c5a82
154 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The primary goal appears to be directing users to potentially malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5580

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://kcss.hu/korosi/userfiles/file/21048049143.pdf In PDF document text
    • http://ifa-astrologie.de/userfiles/file/99038585219.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/19916526209.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073cf8d41ba0---tebuzozejevos.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/23116602992.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jenagizuzudovarab.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/73989790398.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/g7ebt5ice8vonmrlpueu4gf242/72166320569.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/lisoxodetovavo.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6130e1ddeffa0785359d841113947db5/bogetexovulurijidofigeked.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073318e3252e---51373238591.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/babivapisiziduwotaj.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/rarajanemoto.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/36986542370.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ffb01b94---dozijozaxalo.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/48334342774.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210901124508.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/wazeraruniduzi.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/golozake.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945d96c658e---gogag.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dkijvhhfp0vhq552n5tk0s390e/40090614581.pdfIn PDF document text
    • http://dezis.ru/uploads/files/pikawujopibafibosoniruxiz.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1d7ac50a3578d05716ca2d5c618f8105/sokove.pdfIn PDF document text
    • http://matras-devison.com/upload/file/rofosoguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=story+map+ks2+pdfPDF link annotation
    • 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_off0000c2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 17180 bytes
SHA-256: ac6527295beb600fe3354ff64189e53db18fde96ab0566bfd9946bef8f357569
font_02_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 10684 bytes
SHA-256: ebe7235371c6e0e9efc2d3bc261b0f833a648cb634a92ef171cc4ea85a327b59