Malicious PDF — malware analysis report

Static analysis result for SHA-256 97637d369be3148b…

MALICIOUS

PDF

78.1 KB Created: 2021-08-18 17:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81f6872f5dcdd6fc3620093520cd0563 SHA-1: 3d5e305fe0f31c7741ca0ed8961ffef7f2d94b47 SHA-256: 97637d369be3148bb5afaf8025e52ba55975de764df94dc1895cb7834c374202
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload directories. This structure is indicative of a phishing or malware distribution campaign, likely intended to lure users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4578

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 https://alakharia.com/public_html/userfiles/file/gukix.pdf In PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/31442668025.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/779d01926ebbcb297b25da77bea008a6/55745882653.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4bfb3a7ff---wasiwigem.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/95tjc9g861kij16qfefl6rg5ds/wiwikezugegaxurowukaj.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/57145644785.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/wulaxunuxu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5baef512---vabipeboralasefulenapidux.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/42662560283.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078a633bd380---38724365404.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/tfcrj09vrn7r2uhm0cpgl7sett/79769390500.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/88358794469.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/mofedi.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703909b1790---72418185569.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/65023717e75636f1828f79e26ecf2886/77640267583.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb41b99166---98250476000.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ae4d4848c6fff0196f743ec0fa93556d/9446876988.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/fatutezigometabixesab.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/minarivisigegatipitaveku.pdfIn PDF document text
    • http://voijin.com/userfiles/files/linasuketubagozutadasawu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b124ec6e6---supulawumifon.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/suroruxoxurekif.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/31960653489.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/firazujimexadetap.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/10576066730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lk21+fast+and+furious+6+subtitle+indonesiaPDF 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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 10976 bytes
SHA-256: d343db46795660f5a75df7ef4bf160fc4fc69a08549cff286e73658bfeeab6ec
font_01_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1