Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa07d71dd7124951…

MALICIOUS

PDF

87.9 KB Created: 2021-08-04 05:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4b9f22f56dda9d52a383f3fb8bf36dc SHA-1: 04335f48c251753dcd3e54c6278ef80ecaf1e6fc SHA-256: aa07d71dd71249517ba37d26318d05e1880fdbdf4efe7eb4e0f239ca879a74ae
164 Risk Score

Malware Insights

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

The file is a PDF containing a link farm hosted on compromised websites, as indicated by multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The presence of a 'download button' heuristic further suggests a lure to download malicious content. ClamAV detection and the ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/83950105302.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8db95ecc---45430478397.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c353e4fe87---sovoralebigevemugenun.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/p0rr9ie7skau64eutfmbcpggo6/36853878681.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/73553342467.pdfIn PDF document text
    • https://abeess.com/userfiles/file/fugavinik.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080065eadfe5---mudimozovelu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/dimenozobapokotus.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xilarun.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/dab3c23b111399b9a6bbbfb0d8ef5c60/babuteg.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/pasesonufelal.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6edb83c102---20948502380.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/50775676823.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/pedizewolu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d147385526---tinatokigekulawof.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/nenekumirut.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/40578720732.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/livenomatotegodekemasofag.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/58394279312.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160da3959e90ee---xarerekenedizelob.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607812ec11b47---jilupujebenejuwojole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dake%27s+annotated+study+bible+free+downloadPDF 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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 19072 bytes
SHA-256: b1736e00ac131bf43fae5aad80fa09d031e457d3e2b577a035483f11e166dde6
font_02_sfnt_off000137e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 10916 bytes
SHA-256: 6a30919221e8533244261f8b967861cdcbcc5321c22d58e3c9a559bf92047d00

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