Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cea39fcac540e2…

MALICIOUS

PDF

78.7 KB Created: 2021-06-27 02:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: fb50d25b3f14bc748d356de96da3cf0b SHA-1: b9ca025172ce50f6b10bdf8413df21997c1ed481 SHA-256: 54cea39fcac540e24ac9a78d54736cc9e66ef693f8a466d5d191f5cd2ab68d6c
154 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 and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7963

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.
  • 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 http://apsara.ru/userfiles/file/zujoza.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/cf252cd99c79255e6a02280e3e89e3a0/katexogeje.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb934b9d6---91026681747.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/wonikosolesix.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/v7p3lo6s5t0r11ha565qh0pp97/14971317482.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9d47346b5bdd387e2ae586db271cdf30/24186755670.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/nomikevojularup.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/mowuzoxewabajuk.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb9b8485c---68711024469.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/fewixavolimafubifilufu.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/71198432010.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080be57a211a---91409098324.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a1f56523---60729069152.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/342e5e7c3ea04d65619d8cc00c03accf/luwetuzuxovibomepaderafel.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/lafobogofexejefovizu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/65461789187.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32f538c9bf---84341693088.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062600421670554.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/putajixugosaxajul.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/zogejeremopizava.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/29758673962.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/40188544836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pure+food+actPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 17148 bytes
SHA-256: 984cf8ce23a0204e7bcc4f79e01a8b7db7f21c41740f06c4d235308c0fbe1b2f

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