Malicious PDF — malware analysis report

Static analysis result for SHA-256 dded66ee39ac3e15…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 19:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b6a597e0c88661f20b6be8c58701480 SHA-1: 8326014036d924b4eab76c5395561c978edfc904 SHA-256: dded66ee39ac3e15b688fab0888c856952ee4b8fa0f6db7695cfa87918af44c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The embedded JavaScript stream further supports malicious intent, likely for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://evo-models.com/uploads/userfiles/files/letilug.pdf In PDF document text
    • http://hoshitorionline.com/uploads/files/65329206663.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161435ed644d36---26847081501.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/16445924236.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/58805005741.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/gulakexapupatesus.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/kowepisinujesojizos.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161424e4b7b6a0---53510909334.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/35178560891.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/xusidamo.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/97984383835.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/dasukuba.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/zazamozemopivolozo.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/84136428912.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/1478147861.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/bapijarugerosimoto.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/95bd635d590e2fa5abd35f27cfca6c08/bojedatapusibabi.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/mejixupapagekapuvutujiso.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9e07c019---bololatedavilixo.pdfIn PDF document text
    • https://europartner2.pl/uploads/dalineposunaf.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/11592965035.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/padaxuvapudonemu.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/dimatezinotob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=apocalypse+now+gomoviesPDF 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_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 10764 bytes
SHA-256: dd47f5b624fa9fdaf0596af0c00c19a35e9b3f7e7ab5e642babd833c87bf48c2
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 17788 bytes
SHA-256: 0c4fdd50047433c434cdd68cbf6269b1b9a1349d159637a8bb2cd48b7e0a2590
font_02_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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