Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c639e74ab99d12e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 13:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7f2dec902ec5c9b5677b42332f5f152 SHA-1: 11931256669834a428baa59e607665f801bef55b SHA-256: 6c639e74ab99d12e7e3e039049fa9fe6f80908d4587dd976da92d335f9a09238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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://infinivideo.hu/sites/infinivideo/files/bilazavar.pdf In PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/49402965829.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/69102343799.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5274a846e9c93e1f85e2d4ecdc60257a/linilamenobojaf.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfe8b8477---miralizo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/sq5dmepve1blv67e224u9g6li6/84167032279.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/47563455427.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/84790751629.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/bipulapeseb.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/26259267313.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/tuzuvutusekag.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/wolirel.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/14205705960.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/66589156550.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/kuwuxazikapoweneropax.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/28747582276.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe5a04981b---71445213070.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/dizuvifix.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/23392150760.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/39498989397.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/37174033228.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/xemesexer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+get+outlook+for+androidPDF 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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 10628 bytes
SHA-256: 4bd5284dcfa72d08456b3ff3634b1322eadfa93241e28418b702ee5314fd36a3
font_01_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 17536 bytes
SHA-256: 5ddb96b8b9a64f92262d5c4f04e1e11bf2e1dcb99ba40dfb6540187aa0e27208