Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdce4d858b5f001e…

MALICIOUS

PDF

157.8 KB Created: 2021-06-29 04:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0c764cbb3b7acb17975d22a8fcda65bc SHA-1: 7d1899b51faff06e07fd7673f32592472c335105 SHA-256: fdce4d858b5f001e8a0752a9cae4f8363d0d00517f9ce5a47ee065a11f4eb8a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c9083ed9e---nesunitixosemiwebo.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/q2ejvcql6c1ahj8pig7udpkr8u/75653454023.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c56fbf667adb759c042ce0eda2b7cc96/famidopiximo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b71509396---9867809641.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/45973828528.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0db1dc7edab6f120d243c2c2442b15f1/xobiji.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/81b348415c677e2730f966fd3168e065/muvoxorazuz.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/db4e0f72eca33d38db9172a6fda71944/kepolom.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb57de1b2---kisatanekajiwifugubapabe.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/72235761415.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5061e9a6afaf12bbebcd77354ee32e79/zulafitopenojegetujamipe.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090eb407a087---gijasorizaxo.pdfIn PDF document text
    • http://bakoca.hu/files/file/zuraginoviwevofepezuw.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886b8f9b060---60492152437.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8b884214---wazagawodetovev.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc234cd64aa---fugogesonovesubedunone.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/q54si4ou218btmipl24j76sgro/zoluzimenifuwes.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7944083b---664971051.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2ec587da4a66f002b75ca349c830fde7/38829175547.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/1815fc0317b8ef53a886b99191ca9c88/kanufenijogigog.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a643e27387e---13226096535.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/puxuzi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815b622f348---dedusimoxadaxedizo.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/18157788726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=losing+the+matriarch+of+the+family+poemPDF 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_off0002040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2040B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C22 10996 bytes
SHA-256: b9de4b3550e244ba78a28760e3796cf818054a1b8eed39257a7417e0bf0badb9
font_02_sfnt_off00023580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23580 19320 bytes
SHA-256: cd14e3b5ed4716e56cc427b523376e94759cddb8a22104e7efefaba58b78e94b

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