Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fecd626fd7e43c8…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 08:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5ca60a21c8a718504c224e414bcf6c0c SHA-1: f7e3d073514ab9e0091014258950dc61f46c28d5 SHA-256: 4fecd626fd7e43c8d4c9c840c684ad0c585db5ee056178c8abf86e6d5e0696e8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous distinct hosts, many of which are compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://daydreamspin.com/userfiles/file/39305070057.pdf In PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/i7sj7fk973t6651tqccuk28p2s/27660776327.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/18v5qqblg1djga8og8t5g0rq96/zuluwozowebowaxara.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d1f938009eaf6f4897ea957e97cfe805/fesosudife.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/sipuxosowewikiguvibudati.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/fb094a5d3291dc0d6597b9332745d45d/96425220367.pdfIn PDF document text
    • https://superpart.com/files/rezafopileno.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/muduwavefe.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021080412301088.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/lakapujivijijirexotapi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077272155332---delilujo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b618bc0f---mowixidimirewoj.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/nokemobi.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/lisepapibobakoxem.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b096087eeed---levixojedadutexuwur.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/zawegosagujimojirisir.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/mufejeviza.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/70638984871.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/sebasikodabasufos.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/beledus.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085df1c2b8d9---74001803626.pdfIn PDF document text
    • https://europartner2.pl/uploads/59300122561.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/24cb33fca0584316c8e6ff36b691770c/nimatitazu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c070d1lk86t7dmo0d8ltnejld5/ruzulaverijabumave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mainstays+parsons+tv+stand+instruction+manualPDF 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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 10816 bytes
SHA-256: c0f4f0a29a4df13d6fb2e7b6439c9aff028f37fe2edd1415b5e13db16bd3cde7
font_01_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 17840 bytes
SHA-256: b6bd5ba9b1f6cb4ed707e19cc55610dc522e1f0806b003ed9d85fd5a0ec9d213
font_02_sfnt_off00012f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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