Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf3de61f50a5bbc…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 02:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f60db8b17bb46f3b3bde31d1e1a3ffdb SHA-1: 36bec1d5c2fd51c8f0dad91f88794a54d20d85a3 SHA-256: 1bf3de61f50a5bbc09cd6952aa8e2261277f01e5dd6a37356e25033566974aa9
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • 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 https://ketchas.ru/uplcv?utm_term=bachianinha+n+1+partitura+pdf PDF link annotation
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/fofoziboxixamo.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/marinakadem.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/dazagipovakefikibopusumul.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/zuxipapo.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/47895459503.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/vogesevigitefufif.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/95765932393.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/83491607749.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/64a262fd43ef304be988574801e9f001/58129449905.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109062226153407.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/9024735446.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vupinewekavefulab.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaligezuxepufira.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/lewenupipudeti.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/30366240306.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16137637ea3ddf---gomoluwodaxajopija.pdfIn PDF document text
    • https://ancoraeducacion.com/images/24790362516.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/21pt0vvuq93i9pqoamloe5djvv/vunajod.pdfIn PDF document text
    • https://atiksigorta.com/files/raruvewerodolupupotim.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/jovara.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/dofuvodanekenibifubufak.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/32514923015.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/58752211516.pdfIn PDF document text
    • http://jcpingie.be/public/files/gexukutugigo.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/13435888039.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_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 10456 bytes
SHA-256: 75166034cb5188ea3bfda01a05b3b0f8b89f9bfc3f333abeeb9ee01cc749e9ec
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 19868 bytes
SHA-256: 4b4d97203fae95fdb57ce5d6dea853190e44d09bfe7b803c5d5ab7de2fa2d7b4
font_02_sfnt_off00012e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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