Malicious PDF — malware analysis report

Static analysis result for SHA-256 75798c49e5e54366…

MALICIOUS

PDF

84.5 KB Created: 2021-08-03 09:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 008edee9e0b9147cb2bd9d3300c7a2f7 SHA-1: f59081b2637b6d51e67dac0bb9fc4ad1372c09f2 SHA-256: 75798c49e5e5436680fba2b68dd08c9b6179667d466b5e971d4616e147b03086
172 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and deliver a second-stage payload. The presence of a visual download button further supports a phishing or scamming lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705e4faefb9---75065883231.pdf In PDF document text
    • https://ctsgroups.asia/images/file/50626661918.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/82814061027.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/perenemudumesilon.pdfIn PDF document text
    • http://fpole.ru/sadm_files/14963969439.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/tevupiso.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/rufefapupe.pdfIn PDF document text
    • https://panama4d.com/contents//files/sebefewigi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7cc0319627200f2c2c811c44aabfd05c/32246284597.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/pobizuvitexewaxesajoba.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/nudogoxufifizudoxakobe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/dojisolu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a6dbc935---50406871633.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/18799bc1f33fb4f2ccb1889d594373e0/wafabonesuvosaberibiremit.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ff001b22c09---jilaxolavewakafa.pdfIn PDF document text
    • http://uchid.com/uploads/file/topodemun.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/13449000368.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/70102580946.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/10389206766.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba42b586927---32875679259.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k2l3sr6enqa30l9mdj6o1dv434/fijuxifujimi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k8qvjlmcl9n3n2vbl01sl0ebt3/serurusewugo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/lizeziwudabukimojupumesod.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc297f4d49216f5005295b9e465f5022/63920125891.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b82cd64b0132134dc38cbf7f2d5f69e3/80048511927.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/zosememobev.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26fea96e9f---jebafekaworobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=top+notch+2+third+edition+teacher+book+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 16936 bytes
SHA-256: 177eed2796a0f01a2920fcccda6523f04a6e9aa130121530c25ef08100c95fda
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 10952 bytes
SHA-256: 7fd1dc1002969759f85baee6f97fc39dcdf486f6c42843db17b0f073f798cfdd
font_03_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 16260 bytes
SHA-256: 0cad94ea7c8ba6740a74f5a4b2ac48d27f66a300b32839414f2b8a05dedfaf1d

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