Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4bafb2a705db0b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 00:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d33fbf2ebb068e6af0b5cc020dcd25c SHA-1: 0e64e3ed7d25d691a4fa5db9cc93732234c3da29 SHA-256: ce4bafb2a705db0bc9d216d37d2564490f9ec2f16700db639b04cdcf93baaf04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous external links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it's designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://savoie-outils-coupants.com/ckfinder/userfiles/files/logarobapijanogero.pdf In PDF document text
    • http://rund.cz/UserFiles/File/25430199659.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/dikamebarufurepunexamuv.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/kazipafogakonimasosazaso.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021712047367740.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096b74216397---76009137552.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/nogux.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/63593420202.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/salegopusuzo.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/78025208389.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/65314adbcc8bb26f7d3b5ab26439ee10/belozavuzoju.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed9adf59b---8172882742.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee71401c22---vukufewizo.pdfIn PDF document text
    • http://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/41850030955.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65c19c86ad---63585702872.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/guzugifetugegejetif.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/q860ogvi622b31g47v78fc0kg5/gikababobifov.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/da0ebe40529bd27dcea580d92f6d52c2/kivadofiwonirewabexurav.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608093a8b5e2d---1221613862.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/xevibowezawazuzaruzik.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/g8hjmqqm6mq12fna2da86ke52j/lafebekuvew.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602002100.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5e3858e447226505b5c598981c384c1f/soret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fast+and+furious+hobbs+and+shaw+full+movie+for+freePDF 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_off0000bbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 17760 bytes
SHA-256: d4ef77560c7285e33742bfd3c107dfb526f8816a2790f5a7f2a80ae2f11da71d
font_02_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 10988 bytes
SHA-256: 26a52dddefa8538a1dbf618320a2211d2170c4ddeecdb554358ee4303925d503

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