Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbe8abe6f91d2da…

MALICIOUS

PDF

84.7 KB Created: 2021-08-22 05:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a821c3c831aa6cbbc8ca987e5a093438 SHA-1: 49ce02e368309ed80fb8d1e27ccbe04f4e244966 SHA-256: ccbe8abe6f91d2da4587319ae99d941c6f715709b36ab305e100111dd5eed479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination of the links. While no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest potential for exploitation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/89e06ccdab4d180c379be6064133561f/gerir.pdf In PDF document text
    • http://a-kamen.com/userfiles/file/tesaxedowavumu.pdfIn PDF document text
    • http://getdol.com/page_data/file/pebedadivil.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe5106657---povonabipamutunu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/82646170600.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/efkskl47r96t1lueve8jrd3e1p/dufajodobazuxikabowiw.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/kijexugupezewojironutu.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/67464287162.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c840d8b9b---8288435569.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b20833a7560---97736298647.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/40855139437.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/dd3758f3bfa95a3eadfe1e12194111ce/79539434961.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/nexurobe.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/dc41144299c064a91a2500b9708bdcca/xuvivebemozew.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7d6543208---ziduresetotarewupotorejow.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2266a207699cfe1da97351f85a8cd20e/52281010360.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/46a02ef01950209953f88541f7c7a3b8/29486589933.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/bosorekowapisa.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/lawepikitimofalix.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160885bed4c6d1---mutafunave.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/52667385224.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zugapazutetiradepekivevup.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/sozuxujivufurikaxid.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0b161698---3920316492.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608352ebd3241---61014213713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+is+rita+hayworth+and+the+shawshank+redemption+bookPDF 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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 11260 bytes
SHA-256: 92c995e2ac391f3e65918469cd766d7e89eb3f0fb1771775ce5d122263777912
font_02_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 17328 bytes
SHA-256: eb4381ff0bd6b184472f089f368a130379d00e8e25b6dec783fed659bde94b58

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