Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae0c51779e34539…

MALICIOUS

PDF

96.9 KB Created: 2021-06-28 13:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f624db6ab03cadacce63a3ca3800907 SHA-1: 4b3e4ad1e8fe9eb8af52b54e505106a4a50b64de SHA-256: bae0c51779e3453981f2d5c96a5175c314638d5b3552dc87a4d1e7068abb8645
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external, potentially malicious sites, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7785dcbc---bubupuwab.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1ef4444c22229dde25da1047af95c75e/49362965998.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a6968d9f---kevamolutevufogemigow.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82dd08adcc---13669317378.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/s75bbbr856hlg5labknhpn3mr3/65672716509.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/f3ibbj82oukainjqc03n5m39q2/19993323446.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210618_802A51D3505403A8.pdf
    • http://aarogyamedico.com/userfiles/file/mibabowubexaput.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1bc80a9ea4729e4df0ec0ef359bb481e/geminup.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/49b6253be9100d943882abfd3cf5f777/vuvenekavesemisekudovoma.pdf
    • http://premium-t.info/files/files/dabinajimaw.pdf
    • https://haysalon.com/public_html/userfiles/file/bigetutog.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/sutebegirisukidud.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e24f0fb99e9e22a420c80a6ffd36ebc6/10454910537.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ccpmi4mo3bka2661k8l2ijkgj5/69633199630.pdf
    • http://techniq.ae/admin/uploadfiles/file/xozupalalivulenifu.pdf
    • https://gencerenerji.com/resimler/files/modogowi.pdf
    • https://hobbes-group.com/upload/files/gewademuzarekapoxiga.pdf
    • http://akinmedical.com/uploads/file/tebibegetit.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/db28e6e2ee97239b170fe763f9c44bbb/48470807939.pdf
    • https://aimara-bg.com/userfiles/file/saniduwiguxugexunenapusew.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6dc76f0bc---59319729572.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/22b2bb327158c707e0848ede3bd829cd/24954959584.pdf
    • http://villa-carlshorst.de/sites/default/files/file/temevogutad.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/tiboxa.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/219be9f147428dd21fc4e1ae336affe1/rubawikatarusa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=reporting+misconduct+in+public+office
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011749.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 16792 bytes
font_01_sfnt_off00012f5b.bin
013f4958ff20f952d19b128d8078af270224bc64a992bae9f9ddcdbaba2d34db
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 17404 bytes
font_02_sfnt_off00015cb8.bin
be8e28dd2419c3c917bab792700ec4adfb183acfe59b360c9f15e927b16ec407
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB8 11084 bytes