Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8815c5f2b28100d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 19:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c10897d44e3145a7d8e0427094f0edc SHA-1: 25300f9987c5730d28f4432745b5b514cf560098 SHA-256: f8815c5f2b28100d281176cc1651513fdd45b29b937ab27311fde09bec61e00a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised WordPress sites, suggesting an attempt to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. No specific family was identified, but the techniques used are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • 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.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130b7a0ee89a---xofamuxu.pdf In PDF document text
    • https://marikakozmetika.hu/editor_up/mawemimuzu.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/samabebov.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/rogamoradogujesuf.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/97578862817.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/dosotofigobiwolapizurapiw.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/3254296482.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7ae4fecd---sakimaxawama.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/73255540102.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/21936977971.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916135120.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/93456236269.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/38424114493.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/41393578990.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/dadiwajilizokizokule.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/64988116211.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/doporajipova.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-05/images/files/46713459479.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/wufazo.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021917844331251.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/94618350415.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/79b0aa1a8a6cb09f6fdb27227b7a628d/ranubep.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/46747794827.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/dikupoxomibole.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/dexebinikupola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=piano+tiles+old+versionPDF 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_off0000b8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B5 10308 bytes
SHA-256: 0f28ccddeff3178f7281c63eb78a02c1feaa3c2d43fb0b2fc0f97993d5e9b686
font_01_sfnt_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 17604 bytes
SHA-256: d11b728a255b1da1a5cb44f2372246bc3d36234866182a49a1a1bd1c032e4272
font_02_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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