Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f891a80d277673…

MALICIOUS

PDF

226.4 KB Created: 2021-07-02 09:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8055bfa57866a72f8156c087c3c97d8f SHA-1: 696e184e3f9c139718f47542a1e0ed0410a02675 SHA-256: 42f891a80d27767345c12610dba07c5b68e3597ada4cf9b9f086b750a9ddd35a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to compromised WordPress upload directories suggests an attempt to distribute malicious content, likely for phishing or credential harvesting. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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.
  • 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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/93ce90cd2b60a2b5d50ee722c937aea7/42762577988.pdf In PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c844a725a1c035711c4baf38e3067cb2/79695947465.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/34114311870.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608310774ac22---77481630879.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/83776813698.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987d53b762a---36460254563.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd6e00089---didevirajogopevodiwegad.pdfIn PDF document text
    • https://faprosid.com/file/mezij.pdfIn PDF document text
    • https://tomas-music.com/contents//files/movawit.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/70307920078.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/63009780803.pdfIn PDF document text
    • https://giustofiori.it/file/kiwozaramejusugit.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/xizonu.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/95809800079.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/90163765140.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee6da71e9---bizenotinugenelono.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/unv9a8ki2e8br54o4kp4k2pmch/61537711235.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7c5c0b2b25f08a95971354707470b732/duvufexeteguwumatanube.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6b5944f7ed3132994145e563159c8e0f/8836510753.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607328fdb6a60---kifivu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609190ad45d76---ramivabuk.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b0636bc77fe9954d6afee3df37aeb9a2/wabarakatidumamiwelal.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608015bf4f395---43923759096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=new+mind+in+christPDF 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_off00030cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CCA 26248 bytes
SHA-256: d81240ceecb6b35c35d5bc95f9396c5304ecbdb6b1870a4206576d3a8b0f129b
font_01_sfnt_off00034c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000364a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x364A4 10372 bytes
SHA-256: 938158ed77ab09172a826cf985b9d2a2910711152598548ea53b362986e691f4