Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cf17a66f0c5afb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 12:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b27f8b86b6d3d77fe02d8bf63583db4 SHA-1: fd3069efe4bfa4f4c53a2dc0af27f9374b7cd7e4 SHA-256: 36cf17a66f0c5afb13ed89ea5c5a6e746bc7b31cd85e98de09f5b03d6767433b
140 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. The presence of a download button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3151

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64db7b2de5---54104854184.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tj2n4e93abb32pl0e4sivh3l10/xuxazirodijavodufowupewin.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/8h2rsk06lbqj2b49leaqsjj9fa/10164214426.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f2d1fe050ac6def28d74778818c4c941/pomog.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/daxepin.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210807_1C010E998AEEA6F5.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/n6k5bnlobhs2639v3uf90t3nug/93986566900.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/reribojan.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/48697363287.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/putexubuxeru.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tunasit.pdfIn PDF document text
    • http://herve-coiffure.ci/files/75036406345.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/241554082355.pdfIn PDF document text
    • http://digifast.cz/userfiles/2966804112.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/73330854371.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/29438094200.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/pulisamurosatonesu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/gigudisiranawerejuvovupa.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/dobixepivavijuwemebe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/451c7676f34f8097f80fd7c3f8c09548/pakuwanowigup.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d867a0bcc---98454374318.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609006bcd873e---zajujirozibodulirerobibe.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb850bd6a---20858337358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+draw+a+fox+face+step+by+stepPDF 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_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 17504 bytes
SHA-256: caa4cdb4cba173337f0442f779e0521c270b2193ec215dc3ce704e842bb4260f
font_01_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 10804 bytes
SHA-256: f7773dfe0761addbb8a0b7848fceedb3408c3167f42233c6448b833abcdcf1bb