Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ca4b5544708383…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 00:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ac85f6c299bd06708866cb0604a140e SHA-1: 71f02eb5a1cd724e610e03b689a72b76785b3e34 SHA-256: 54ca4b5544708383348915ccc4de352a96c9cdf8aeacd8c05657560643468335
220 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple URLs, many of which point to potentially compromised or disposable hosting. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy/paste commands into a shell, a common technique for executing downloaded payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://euro-ex.com/images/blog/file/68432515446.pdf In PDF document text
    • http://cokhixnktientien.com/Images_upload/files/sagumetepikukeziga.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/90912069291.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/nemesig.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kabimawonanikoduna.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/rizewoxewagir.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/migepumiwejalalivisi.pdfIn PDF document text
    • http://kbchina.de/upload/jowib.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4209656189.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/91906995480.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/duwopavibo.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631135179.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/52099553327.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/widutem.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d96be2517---lewizoxifejuzakukololon.pdfIn PDF document text
    • http://mfcpavpos.ru/file/wilam.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4944f4df9b9a4b7cc8188acf244d4b5e/texovogalibomexo.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/73387192649.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/marajinakefaxugofilux.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/junutozexeganimex.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/22140422476.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e9562dd56e91a5ca8f7770640cde8f37/lefezo.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/90030922717.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7303f16d0e44e602bc51c57c61e68185/67920936575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=build+apk+in+react+nativePDF 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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 18592 bytes
SHA-256: a32ed8ad0fa815d142fff61b4900081566f315411565e6d710886d9c4fb92af5
font_01_sfnt_off000116ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 10532 bytes
SHA-256: 9fc505c3a8640882e0e66f3c8ed93a610af6c736f2bd0a7dbb6d5fdda2090011

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