Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6606d21158b3f4…

MALICIOUS

PDF

88.7 KB Created: 2021-08-01 20:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b77473fd708867fe119adeedeac85e5 SHA-1: a12d29ac2c4a0c35f84b9bf168569463d1c5e07e SHA-256: ab6606d21158b3f4077741a6151e3961e61bee5b917a554b1aaddd25192fc7ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fa5388b0---ribeker.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd6173be90---57599988911.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/6560541441.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9c37b165e1badebbd4d242d55009d0d8/gelef.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcc60d8e7---54628708880.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2c65055640138a15846b947364dfd0f1/tozovexosobagebonibineje.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/taxexadovubupe.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/zaxadotevexopisorovoto.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d36016670---geloxozimen.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/memasupapomevusuzesuna.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/t5ir3fo5aa8nt497k0f9ufovk2/57268776906.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/2c3d9a9fc059ec6226de9b974d1bd097/wisetomakutagaxivarar.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/sejopuneburedasoxezu.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/fuveguguvubek.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/89565518532.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161025a2c8e8f0---61900946803.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044e33b4d74---tasajunemalaworumalojiv.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/muliwi.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/rubujoposoxox.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/kiraburusezugavudofuzute.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160dd749ad248d---tirarudab.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/3132e8ce4c6a7dd08c9796d118af77af/mopidafitarubeleru.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e79095278f1c0e8a36597aec2c28119d/rabipofemetinuzowime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=commando+2013+movie+watch+onlinePDF 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://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_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 17388 bytes
SHA-256: 81d822b0141a1f9996acd409b4ec7d9ecfdc2c173709536f4ddfca4dd7e1a8cc
font_02_sfnt_off00013e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 11016 bytes
SHA-256: 9e3752bb6de9579bdac667e4a69fd7eaf7a9893be52e73822720c5817c5d7706

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