Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9ff93c63edac4e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 06:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e48dc8a0ab20902f94c67dbb6658685 SHA-1: e14f80635dcaad387d42cac362a259faf728573c SHA-256: fc9ff93c63edac4e003965794d0b2412a84a64f0a206dd243c0971388027182e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6693

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://maezawa-jidousha.com/js/upload/files/temodezog.pdf In PDF document text
    • http://medwin.kr/userData/board/file/lutixix.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/guzaxugisofe.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17c1c914c---90895358404.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/fafatawade.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614420abc7b17---21430726102.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/97055801028.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/jigilaforodotanaxoves.pdfIn PDF document text
    • http://chikatere.com/Upload/files/nefadidasoderudefizebat.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/75776449199.pdfIn PDF document text
    • http://czyxchem.com/upload/files/88419509947.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/36990227832.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/18285338302.pdfIn PDF document text
    • http://precisao.org/files/files/2100429687.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/xonatogawabafakaxozefa.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/buzijojep.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865b84ee7b---70245922990.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/beguvedodel.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/kebuzun.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/83dc9a06ccae1ad6ecc14967e9c89517/65763565924.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1866ba673---fopijakixovokupojuro.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa923c703---1569761232.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48855508917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=macos+arm+raspberry+piPDF link annotation
    • 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_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 10536 bytes
SHA-256: 654c653c4bc80d316a304bd4f5eaa5d610b00943a8f14e4761c292736cc622d7

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