Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9829b7a2093ebf…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 11:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5b339a78e0c8a73b50e7c9c53c54c39 SHA-1: d8587cdc8806e865f98371e8d99f60bcce5e5a49 SHA-256: 7f9829b7a2093ebface31464ca3800c755b08ec7bdaa1a687bfce5a3fe5815f6
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing a browser extension or update. Multiple URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious content. The presence of embedded URLs and the overall structure point towards an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=phone+extension+chrome PDF link annotation
    • http://wdnederland.nl/file/nolivuzimagopagan.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/50889225120.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/fokiwufuje.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70a5f40bd---duwafixetutupipikenatajex.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/76012907207.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/mozenokuwukebufuka.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904191052.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/dilewe.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/jogad.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3675a59918495e52f48be6728ffcc223/6639610411.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/44363359669.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/4290473256.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd67a5943---80819949978.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109120259089511.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed536af7cf---13084390123.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/99316411743.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/976af06df74c9fce3f5b5e1c772af6c9/91615618008.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/bujazijupu.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/73939406485.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/galelozaretalesum.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/vikilaperosokuxizinikuxa.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/46463440931.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135483e564cb---51817392843.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/wumotiwibe.pdfIn PDF document text
    • 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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 10392 bytes
SHA-256: 6e933c4bb879173b958b7de7b3aa9834f2a0ab1f812d2838948bf59c5e0826ec
font_02_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 17916 bytes
SHA-256: 112fa04ffeaf2b33481f86bcf1a3d77e14a086fb9c7d60adb2ec0a2c93fc86d4

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