Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eddddf9f289c870…

MALICIOUS

PDF

80.3 KB Created: 2021-06-29 03:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e86edb9960be116a83d230ed40a6667b SHA-1: 8516d5e9bcb35b0ecf926914ba1970de515c8092 SHA-256: 1eddddf9f289c870a53f55ac5dbcfe75718f69b9a183e45a914b67abd4fe87b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection confirm the malicious nature of the file. The embedded links likely serve to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=convert+note+file+to+pdf PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ilmug50ijgu8i579sksq3kstup/lifijafasebazitovuzon.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f2pk66lv969dl81c0onbfrpgje/dagurovaxoxuliv.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9448a419dff04b6420dde54690f440b7/fonozapuweropizaburox.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89d4959bc---puwivuxewikotorisidaf.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/3494856092.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6anki5cn7pbejdruju5ifbqpcm/lubazafevafixifupimewomej.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740319aabd5---tozatojotawuronubem.pdfIn PDF document text
    • http://hydrem.ru/images/file/nidodovupifabodoji.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/ruguwolasipawedijaxak.pdfIn PDF document text
    • https://etimes.mn/uploads/files/pigedopirimedepinunukoz.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160be6bfb2dccf---tesutuwivuwigusubo.pdfIn PDF document text
    • http://atomleasing.ru/media/File/fewexuma.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f1767950---jebas.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/43336951622.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/302nv5lp2j7i62kl23st3al52q/9158673345.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bab42da5d83---88603129432.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37dbc9122---32922810623.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/354c094a9ba5f6fbdf29f9d159cbc61e/5086804552.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59ee51aed---guganepawuwomuni.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/6kkaelrakgq628j7qd6v982qr2/6983697094.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/jojodifurafuwuwodod.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/28201370938.pdfIn PDF document text
    • https://susta.vn/userfiles/file/27130510134.pdfIn PDF document text
    • 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_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 10260 bytes
SHA-256: 05fb9ef4ce0b254bd1791f33c3b4b493d66c7b2ff03416a0147b954330b68d6b
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 17180 bytes
SHA-256: 47a21f15f0f7a745053c39b4a98479debbfac6831b563b8bad1c1bb85d7fdfcb