Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4874f8c36ef617b…

MALICIOUS

PDF

84.2 KB Created: 2021-10-23 20:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 40c625ce5efbdb7e2bb1038d21afa43a SHA-1: 7f5698d2fe0c1c374601197f17b8988358cee8a8 SHA-256: c4874f8c36ef617bcd78fde340b0dd5df2cdd468bcb4bc627fd1a9a27d1b909e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The PDF's structure and the presence of numerous external links suggest it is designed to lead victims to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ae98d4fec6---95947477644.pdf In PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/kegokowamurizixubenobet.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615fd56acfb81---59857765763.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f57394cb64---70546273129.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jabiruv.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/34521194740.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/wajotemo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/rimatofagajeki.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/41040660779.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/62461532594.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9d623242378f71f8517b3fcba6c677cf/83233820004.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/nufig.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/kurorazuk.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/49629235657.pdfIn PDF document text
    • http://yepuco.com/uploads/files/46675577133.pdfIn PDF document text
    • http://agavietnam.com/img/files/vemonejenosotutexar.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615c07985bbec---15536680671.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613686cfc9def---74923109540.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/46177336003.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/dimijasulifix.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/basinexevevumut.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/lomazo.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/rexegulidomozubonudu.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/tebosobujurasidegegoxatas.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/zetozavefisukuveb.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/meav23k9tusvlt34lk8iv64lr6/musapugisutowevuzavot.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/3981976313.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=pale+clouded+yellowPDF 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_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 17736 bytes
SHA-256: 6b8f28c2f52737b6201d39b24eba91f5bc2c1d0fcdf9d5ee81f4aa1ff8f80bc5
font_01_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 10104 bytes
SHA-256: 3c6bb473511156debf3bd80b403fabba6803f429c7b777dfa2089d8e2dece750

Open this report in the interactive analyzer, or submit your own file for analysis.