Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d2f7cd86042617…

MALICIOUS

PDF

82.6 KB Created: 2021-08-26 01:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cbf01372c5d0c5cfa7900a2372a165a SHA-1: b23fb402a9b8c4c55b37e38f84f04be74f7a2ceb SHA-256: 11d2f7cd860426177d5907c2ccc6d4f3fd87c71ac6e3b920a599c96b1d86fc45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://stiff.pl/ckfinder/userfiles/files/89665411306.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074af052b8b8---97077131566.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2593da46abbb479e6f5d09f8d7beeee4/83195602873.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/85615294886.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/23a93d0478eb3c63e1b10f8081e7e94a/14150902388.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/zaxexoragisabinosu.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/24535970724.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc8f8a35f10dd4e37fb043030d2f3a6f/fokobegomemewu.pdfIn PDF document text
    • http://chikatere.com/Upload/files/91352137395.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a35c618d7716758280e344e405b27a60/31835048341.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/bivadenapamojixit.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/rlckc6he8fqdoecj07ccuuakei/gemunojaralimakutodobinop.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161044d8e51afe---59421770760.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/nonuxefemozu.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/sanefa.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/bexikodawu.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/86292916644.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7400321ca---damurovilesesesova.pdfIn PDF document text
    • http://abwva.com/uploads/files/sebemofoginiviredofukopa.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dshkd85ulu12fhldismn1l2h5f/34880723590.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/sudupisuwudimuv.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/zifosenakedusuri.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/12d91ce37678b4f2595e67b8cf938382/wowukuviguwenel.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf5fd4339---12514649325.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebb8c3135---pigejupufodobudeveg.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/58349982477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+inductive+reasoning+in+biologyPDF 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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 11064 bytes
SHA-256: 33a4cc750252705ae4a912eab89e540db0dfdfc13a4c119802ee01c31567bf85
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 16932 bytes
SHA-256: fac2d8f03223ccb409b7878b45e222d1092e95b0ed34c887403af1cbe121679a
font_02_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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