Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4446304d7715a8…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 19:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5b034e281bd2a1240ed0e2978d3f45a1 SHA-1: 1e7bb7d4eb7d9445229fa49b879080bc51d1aa4e SHA-256: 9c4446304d7715a879f4ddd1814b93afaea9dad1ed02e1be5c4097f52edeb591
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The structure suggests a link farm designed to obscure the true destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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
  • 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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9948216f---rixita.pdf In PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/58926375701.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/46844479015.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615695cdbc81f---walojajuzisujuwofekas.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/vjf9bns7pvrb1v4ll6fr5drfn4/58611507175.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/28680110259.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe54df8a0---tixizezofiraloxukujete.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/32651377975.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210905112257.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/638aa9b8aff02c747596626156d13b28/zidomewowuvetetoxuzupimes.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1615390f460f55---31379275906.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/99822158992.pdfIn PDF document text
    • http://exosushi.com/uploads/files/82097001520.pdfIn PDF document text
    • http://hibertek.com/image/files/20210909_004959.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/xalumekani.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210925084818.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/telonasexolemolajosi.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/pimisogujikezujikapaze.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/nanaseweporutexup.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/22506280595.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/zomidajedunuze.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/giragokegejizigovokes.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/zutaboxaselokebun.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389c0de2765---nebajixonotat.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/mujaxilafubibivabub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=artificial+intelligence+journal+pdfPDF 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_off0000b1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D3 10840 bytes
SHA-256: d5c85ab147f0de36a7d11a05a33e0c78269efd0c84c2b0e25ca0c6e4e04c2158
font_01_sfnt_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 15232 bytes
SHA-256: 4438e4e116e509fbd4d66ce1196d3141cba56ac0d7b8fa79064660ea104583ea
font_02_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1