Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4f34c9ebf5ffa5…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 05:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 84fdf678a1839be5c469d2fcf8f40e5e SHA-1: 4d77dd9fc7d6bb821f15e2abe1d4ca87289d63e5 SHA-256: ee4f34c9ebf5ffa530c9026881a475a8cc7f2d0d68ed90e0b81877531a2b0833
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://onsale.social-push.cc/data/fckeditor/files/xedajavetididuvev.pdf In PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/84518421852.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/49567527790.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614827ec28ece---lonoxewaduzanojizu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbd3824d6---gavokudubozorunafebofo.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jowuma.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/60094389071.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3c53b3bc32a79aa409421f08d10d3f0f/dipojinuzinugedidaxirej.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/sapaduto.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/21433197141.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/89766634035.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/edb8dcc6b1d1ec97fd40037901186d40/falib.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/42367328263.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/df7esefucvf65mi2d1tf72eusb/felavut.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/lumerimanugunuj.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/1456644702.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/61594122551.pdfIn PDF document text
    • http://chinalabware.ru/d/files/52499250160.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/7344871163.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/1488578325.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/42515697919.pdfIn PDF document text
    • http://philboyd.com/39389288932.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450c19018ee---13772092051.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/ropugapunugaturanofari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+word+mPDF 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_off0000ba13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA13 9892 bytes
SHA-256: 95089cd16058ce8c47ad33a7ab4b50d2ab187bf80d1c59710989bfb6ba88e5be
font_01_sfnt_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 19520 bytes
SHA-256: bbe57dd9917112ceb625661677c506fdb31bbd6ce07d344d47bbff2c2fd9c183
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1