Malicious PDF — malware analysis report

Static analysis result for SHA-256 8384d9b410824070…

MALICIOUS

PDF

101.0 KB Created: 2021-09-05 22:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 512b36c0e5e11b357ef68650f734d183 SHA-1: 045a73dafb78c0d32022b32206cde48b69810173 SHA-256: 8384d9b41082407085d2b6f7f7b3887c386558004b83a699766d1303b6ca5d46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://whatifitspossible.com/ckfinder/userfiles/files/12459232799.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a039cad8e---43924401438.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/fegaf.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/bt6fshlbfc5ngl37t81btcjba3/konilisimigovividesag.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/lasozoxugabobumodilak.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/fotopopuzaxufopowusisubom.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4d737fa6b02309eecb937e7150444bb2/famaxuwoxogozabobebajewa.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/paletozaxokow.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/rudozumogejujelufowisew.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161193df5c979d---fibid.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/922196121112efe06a9ee98f1ca7b788/15709340758.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f70e8bda8---21547771211.pdfIn PDF document text
    • http://teakdeck.pl/files/file/65378811869.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/9ugagmt4a6051urk333pb0nhlb/7488217107.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7a7bf1bf---22829341303.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/22172290326.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2822dd59d---53000726234.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa05c9247---65541835619.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/gegabirexasalulewavo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d341587ac---32972622322.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/34323859703.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160897bb636ddc---muretixivovito.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/bewukirat.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6b76833a50fb6aa438a880809181e38c/perufejivekelejamuxi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6148fe7da9059aeccd6714d1d70f95d1/jezalibomereneserimozatev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=figurative+language+definition+and+examples+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_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 11088 bytes
SHA-256: 550fb05f3f29f22ba22e4c87557b71ce20f39b7fb2b902e3dd4745085f8ebcf9
font_02_sfnt_off000154d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D1 19436 bytes
SHA-256: 2da297ff2075d1e768e2dc3ac9856daa7e467f0e5180bb7aba700df9f91335ac