Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c1800d0ba9f841…

MALICIOUS

PDF

70.7 KB Created: 2021-09-02 06:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ced34ecfe9316b4059d1f142da0ab37f SHA-1: f1b1d55193c5a5dffb02f7805fcd2411b2da5391 SHA-256: 37c1800d0ba9f841c0db7b95286ca0c967d0115bbfc04a770ff35c0863440634
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, including compromised CMS uploads and disposable hosting. The presence of embedded URIs and the PDF structure suggest an attempt to exploit users through deceptive links, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7341

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=rowdy+baby+song+to+download PDF link annotation
    • http://kozhencherrymtc.org/userfiles/file/89180587166.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210531_230125.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hkqr5httbkjuu9j8eqcevuf0nn/niwojamususo.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/vusedaxogebad.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/4807764622.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210707/210707191517171269gdcsmgf9ka2h.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/67171070974.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/5483216219.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/41990613288.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e2f24f0e---topokenujunetudibib.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/gewifajuwiweduven.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/fetijibowerijipiwe.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f7a568447fdc2a9b90263217011a8f01/romuk.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/59094961503.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/11135453000.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087238a91477---81995805178.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/zonabosa.pdfIn PDF document text
    • http://tfforming.ru/d/files/75405516051.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/4495099001.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/56bc526183b9dc436469dd2db76d2663/30111549271.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/tomiv.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b8a6a251102---letosesulefolak.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612750ef06089---78560185980.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0c5cd059991ba9eb959f89a2ba376373/11305380822.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/tagizegubadopuwisapixa.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e3fda4e6---bonivegibem.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 17268 bytes
SHA-256: 091d3575f61969c635bc1f0350e60b8e4249cc1c44a46ba91d6992b51aa6f879