Malicious PDF — malware analysis report

Static analysis result for SHA-256 529952e6c7becefd…

MALICIOUS

PDF

256.4 KB Created: 2021-08-01 04:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 1748a9306385808c7247cd82e4f927c6 SHA-1: f1d671cbb8af57197c042acce7244968ddc5466e SHA-256: 529952e6c7becefd91d590fb99de2c3bf7a587fdc6b631e99f7d2c47cb4178da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

Heuristics 5

  • 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.
  • 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://ckrestaurantgroup.com/ckfinder/userfiles/files/zipeg.pdf In PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/25395428fe4c5298b6743790d5c98c31/tinufamudazavi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74225537e---kugodijobanizubejezakorex.pdfIn PDF document text
    • https://ckmandarin.com/uploads/44246879941.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/vofugikinuxevop.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fusipuwonano.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/kikawimogeki.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/47096775243.pdfIn PDF document text
    • http://chapelguild.com/images/usr/24652367207.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc10311a31---velevesezifalejenadojibeb.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/64941039235.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd2c953694---26537283933.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0e0e0d775---gababafito.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/62701708648.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd48a8431b---17840944448.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/25884324654.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/78540837742.pdfIn PDF document text
    • http://raczcsalad.hu/files/70766222477.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c776a20d7a---rapewovu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hpkejgd4k8m9iu2fctodvrf5t6/nerot.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/tipogurilusaremuf.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aee7ac793---sakodugasomabevelebilufub.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0048638c0b---zowutejobanigixidula.pdfIn PDF document text
    • http://industrialdevices.in/uploads/dumakalomipugin.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/ferapeburijon.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/cml70am85qfh4se6oohernrhc9/jakipovakuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=forgotten+fire+important+quotesPDF 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_off000395a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x395A1 10876 bytes
SHA-256: 76f34d3dd938c183262aa94a57cf3903f44769fd16617ebfaf9f63ab7f4a0fea
font_01_sfnt_off0003ae77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C689 17012 bytes
SHA-256: bb3def47294f55794f479b0bab9ea592e4c76f847b4390ee721178ef81c19a84

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