Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d792e6db552831…

MALICIOUS

PDF

76.7 KB Created: 2021-07-25 21:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a84009d535721c077d70fe69e9caaabd SHA-1: a9f53a7ad08c98029461c1e9f327ccd718adbe85 SHA-256: b6d792e6db55283141f10138f157e9e7ff2d62a34f7912a0c39c71c754ae763c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 6

  • 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.
  • 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 https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/65d99adbdb876bc88952128b03eefe00/vodeteladokotavevutiselaj.pdf In PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e6fd36c9b08f03b56633aa85bd4aa785/48306372864.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/33766190020.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/gojixadukixevowozafuj.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/rosimaf.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/72e3a42d99b7cdf0c606405b2620eb3d/xatiweje.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/11228028742.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/todekuvutulebaputuwuk.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/xozavoledejuwu.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/24/file/20210724_225850_107.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e6f89ff7235aec3781cd90e008dc9c9f/74261638648.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838c51be03e---88231164256.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/wagizumasebag.pdfIn PDF document text
    • http://agro-partner.com/Image/files/sefusuxuzukosasejimire.pdfIn PDF document text
    • http://talleresjpg.es/img/file/zepunakul.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e52847a778d---673180647.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/mejovafuzulunidokulosozav.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160797cbc07707---wemifipulomekafozexo.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/73281270127.pdfIn PDF document text
    • https://congchung7.com/upload/file/25948453797.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210630103503_1527294548.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/31284240996.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607853addfa08---wukuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=jorge+basadre+historia+de+la+rep%C3%BAblica+del+per%C3%BA+tomo+1+pdfPDF 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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 11260 bytes
SHA-256: b240b4860a43a437cd3db46cfb0f6502c039fa7c99475e008424641430c0398f
font_01_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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