Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4dd4c7da8704a5…

MALICIOUS

PDF

91.4 KB Created: 2021-09-04 21:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6da5aab1a48987a5a4562dc39b64895d SHA-1: a7d4171e90cf87093bf43365ede22763fc02c32d SHA-256: be4dd4c7da8704a5cd420bc6e248cf12b41b950b4b5c631e9b53c8ef287e69d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3299b7abe64e0a460e719b9705d0eb2c/mutetirevowupegemaben.pdf In PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/wogejutikotunobaweladom.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lozujowapejulexitoz.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3fbc6f1fae1d7bd6ed67f2d0085a3e65/bunufibisopuwimexesoweke.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/batumaxumaliv.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec91ae24a9---29893870343.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/xikexagujedaz.pdfIn PDF document text
    • http://www.centralperdana.com/file/sifodaditojolimefateb.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/65427337370.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/57262328659.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/suzexupezeguvadarotuvas.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/49813164971.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/95o0351c6sq4fhjqjpcp6hd2jv/64550623702.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/13057927705.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/39dcfcc3271ac1831dac2e21815fbb84/duwupovupokerobefularijox.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d2129984---16417212296.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/36981173693.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/73130017143.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fivororilokukejijobi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gotatupenakekajuzegukike.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca24c8f254---26474793222.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/xixuvomekabasepadabu.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/28405962375.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cbd3ffc98a68ce971f69baf80070899b/80489641505.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160798446e5feb---60148497729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=2004+mitsubishi+lancer+ralliart+manual+transmissionPDF 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_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10956 bytes
SHA-256: 9a3f23861141070f36ec627aaae20b1583d4f6d8183111b27834e2ba8d5481af
font_01_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 17940 bytes
SHA-256: b784b0ab3465ecf0d079b3a2523d9dbdae00520e1d0c28d60c2f3d887bc2f505
font_02_sfnt_off00014797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1