Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a05f2bd2dbde6e3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 20:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa18f1c6fcf00f72f9e1cce0b9703054 SHA-1: a3eb791934909af225c87496f652368fa961f148 SHA-256: 2a05f2bd2dbde6e3dec07b16cc520f463d9b1933a1c0d9195f86c2ee7f921f72
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress upload directories or disposable hosting, increasing the likelihood of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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 http://reversetheclocknow.com/ckfinder/userfiles/files/40331977337.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/e34b9kqbtnrm9pnpdo6tg71o54/guvonujidifumijuwagup.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8e857a298fb66545433c689922e0db2b/bumifamezuzipo.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/nusupuwefuxufamudaboki.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/kazasotutoxezeb.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/fawamavod.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/48815638612.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/84017513675.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/guwira.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8f7a4933f458e4021513f72f8677216e/28284290420.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/32592717926.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/sobuzizutaxuluzubi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff47225689---nuxofusutubi.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/11549557975.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83719237b3---39481088908.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d06dd6f743e6ec15de2e77b4359f58f1/56184348919.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083824573eec---losowosukawovewe.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/50906560308.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161204c268003f---sowojikafoliz.pdfIn PDF document text
    • https://frisch.ro/files/file/57425718850.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/68758808435.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607abccd5ce9e---murodixigewisemeduk.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/87322903590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=volkswagen+tiguan+2018+manualPDF 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_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 11100 bytes
SHA-256: 9f03922c3b8b71add596833da76bf295bb2a50cd245b78bcf3f714a91053d956