Malicious PDF — malware analysis report

Static analysis result for SHA-256 e532cc5e0b0d37c1…

MALICIOUS

PDF

101.4 KB Created: 2021-09-02 21:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 558957697c937fdeec34784abf3ad175 SHA-1: 5107078b4ad23907308012dace04864320bf6d1d SHA-256: e532cc5e0b0d37c1adfe27cf3ba6dfd0f55ce0af722762bc151090b3c31ae303
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. It instructs the user to interact with the clipboard and execute commands, a common technique for downloading and executing secondary payloads. The presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, further supports this malicious intent. While no specific scripts were extracted, the overall behavior suggests a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 7

  • 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.
  • 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://thegioituigiay.net/uploads/files/gofawozesibavola.pdf In PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/zozunawusuzileg.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/xadonulevabek.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608460eb2cf6f---50765447314.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/14924803786.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/xuzodinegimas.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/50209004698.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/neroneketexof.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/27287763623.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d2ea78ab---99768335003.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/rufizarisitorifadamelawez.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/93123876127.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/b8856280a6cd806c632c75f3709dafb3/20968947206.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/36060897034.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/komarapivawurupibetove.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/2120198812.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9eb489d598---luzijepeladixagosemezad.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aafaf36bfb---lexedav.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/lofelosivusa.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/46675741189.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/34663802973.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/jejukizipem.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6194774359---33178830346.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/bejedujelukabikivotirokoj.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc4ce2235---mimagokaxapekezafav.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/zakufavufosigofuvujinore.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/sinevupa.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zuxigabexoniwixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tutorialspoint+pl+sql+pdfPDF 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_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001410c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410C 10568 bytes
SHA-256: 91ebe25631f6ac6b9c77b3665c96093c68c67cce303cefc95ec106ecd292417f
font_02_sfnt_off00015900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15900 17840 bytes
SHA-256: 6d6e1bfdf6cdbc0d6978c1f1dc5044fa0fc898f9cab6cf959d8064f21abcc5d8

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