Malicious PDF — malware analysis report

Static analysis result for SHA-256 712c57a859814efd…

MALICIOUS

PDF

90.9 KB Created: 2021-08-12 17:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f97b14f1d9fd155a47c20f188b858cc7 SHA-1: 02cd7cbb8e41333e12a0a183951390053b01cd14 SHA-256: 712c57a859814efd6402e3165396a0cf2c644ebc3069a2b8c23837857af59408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are typical of malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b9342e1a78e3344cd8199f6237b8e7a9/gulawopasulukijimakokate.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0e8u5g47l4f1h42m0579cujcsd/95345655350.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f3c957098e9c0b7e8a7cd51058177a95/jadosejixe.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/bipibimuvavopozusowakimoz.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add86178ee0---pozolupitimipaxegu.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/r8e9vn5tnh5ohi89hhtkn98712/4114036737.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8acc1e97db5fd05798d0aa79bc5ca080/74744011011.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/qf8lldqtbhhjluj2crcvflmbt5/8992145490.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/11287312825.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/7090873084.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/22836558578.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2e65d48795dd3b5de408ff933c4b78b4/nopisakolaxegoxogigabuw.pdfIn PDF document text
    • http://wami.cc/data/files/98779346001.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/rabadojikopomodege.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f6a6a1ac---kelegusuxuwasirakun.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/fa9f0dc8b3ea6448b9260cfac5b8f70e/54893405358.pdfIn PDF document text
    • https://ienter.bg/files/62011750174.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/92f17aae62cea3f5f002835728d80b41/nenexasaxolumabedafalev.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/zuwita.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/gejamew.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/46245772527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=crash+bandicoot+ppsspp+emulatorPDF 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_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 11048 bytes
SHA-256: 67711945af0475422e2d95e8b614784983ce3d2f4dbadeaa5c728c841c96ac74
font_01_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 18420 bytes
SHA-256: 5f222877cd5f19601ca73ef0b3477c2c5aea400c398c69688882780c5c55a52e
font_02_sfnt_off00014407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1