Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf98b1718201aa44…

MALICIOUS

PDF

83.9 KB Created: 2021-06-30 20:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3df2e1f8af57f43aa693ba191d7d2933 SHA-1: 11a6a6b652870724fff36ab3ca5bea86985a1f2a SHA-256: bf98b1718201aa449d18a54cce956fdedfb61dc601b8ec48fb8c004a36a4ce46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=f2+tamil+dubbed+movie+download PDF link annotation
    • https://samavetpharm.com/userfiles/files/sojapagomutenofanuwuri.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gumaduzedoziligilo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/afb4763b91f8906f5b6064a1ddffe66f/90786455284.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ciq9n51u7qc406p6f74v5fdsr4/sulovemi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/om5oi386irf12u0k76kb76l78i/jufugofixubiv.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/4163508794.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/fixilerezawozu.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/toraxisasulevikonejoxen.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d3b45959516ffde2a7fdd0a6624e57b0/46125682984.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2edc946df7f6ad53cfa90b9b1520b0df/21455287242.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/699f3adccee47ca5e633e0f28cdcaf12/12247152857.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a4bfc14b2---zarivop.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/14b0ccb385d3c489e6a3714b7ea0ead9/pelodefotaripojowivura.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/damexakabeguliwi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083e80d3a011---49390739647.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8509ac25454e7c005fec44195f6317d0/nitotapefapifopebi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6be62769c4---61280915051.pdfIn PDF document text
    • http://geose.ru/userfiles/file/23850325687.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/46629475096.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/54489554643.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/26197236561.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083fa3783c2f---25069698564.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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 17088 bytes
SHA-256: cfa152ac7b89e438c5f841db148583a7dce2024e911afc87a9f3a3b69c52383d
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 10628 bytes
SHA-256: e4aee1d37f00039117ec1f99aab9ac8c1cf926d30a6a28581ccba638cf025f4e

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