Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b26fcb21387f733…

MALICIOUS

PDF

90.8 KB Created: 2021-08-10 06:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2da79af4d500f2469b4a47eacdb378c0 SHA-1: a649d76762eb2f25155527023d2490503c866054 SHA-256: 6b26fcb21387f73395294852332393c483c6d6f751d65515eeac119e68a891d8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external URLs, with several hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites. No scripts were extracted, but the structure and URL findings point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://a2designbg.com/userfiles/file/69265792980.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/d14di8u14557gsdrgq8q82i1bl/17802095320.pdfIn PDF document text
    • http://www.pvvc.cz/files/tujufanifosowavuka.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/refadipevu.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/pejevawavipabomevij.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/56ec39191f80cc4c501495c4480d35b3/fodisufelotogerugir.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/827fc532a6a31ef2d991ea38c779a67f/50372749207.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fb56c6f0995c584317a6f8e9c62dc213/podujujat.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/64893262171.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/115033f2a44682a979083b9c47659381/bisirojare.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e92f9b07a8d11df1d8b7ae8d0bfb3f4d/jijadadokexodiw.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/boribiwa.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/89216946453.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/fitefurobajoz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a9ac8c38e9c4363b74b5e48e7e5fdc98/jajim.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9512871e6---71321748444.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/nenurilos.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/2315039771.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/59981500430.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/gudinukal.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/64039962112.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16111c182056e5---23336898622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gidion%27s+knot+free+pdfPDF 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_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10448 bytes
SHA-256: f3c75e76604b1d72d7f9ab965c7eaf22423165841e2d7402006b24c4620cf8c4
font_01_sfnt_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 17656 bytes
SHA-256: 4f304bc13e9a2a0e77966b952b5c9183d4ebbcba4fa90167ef51170da8da9171
font_02_sfnt_off00014272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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