Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eca6853a59aa244…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 05:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6ced743b4053da715c82b765fc442c9 SHA-1: 09fc519e5e1b82e6bc7a351c994d10a713690d62 SHA-256: 6eca6853a59aa2446babc80b59a2b6d10812b2b7f11747efa676c33b59d7e779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of multiple external URIs and the nature of the heuristic firings point towards a phishing lure, likely intended to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=tutorial+pl+sql+oracle+pdf PDF link annotation
    • http://seoaudytor.pl/userfiles/file/67228513949.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8a090f5d---janaro.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706ceadca09---23185900729.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/88a6da45ec77adacc128d5311f1a6818/waziw.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2950r9oo3m0e3dcvd5fu6854qa/kakufululoli.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/gavulepusosaxizuwalige.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/winoriletipipezitaguti.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/meu908u90rb3jd0vnr4qgauksn/76561432270.pdfIn PDF document text
    • https://stvorki.ru/files/file/76882657112.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/lotilupowululotugaviru.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jrc0spfo8fo4bhrds4jot47pql/50505776490.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088246ce7eaa---92424164635.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kgd78q45ur9gana5gcai7tkupa/54312918416.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/57107091716.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/35416924779.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/kmbs4pls8d0g33953buiovnh50/98754154000.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/sakidanezisavevidonu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b6db6f09---58656059389.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/50535839887.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/zeler.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/41966800701.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/zezagaxox.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/dlhsgc6uvqcti7oahrpget0593/99021018653.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dc36b16e5---95710972924.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_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 10716 bytes
SHA-256: 1cba80b9277d4681277b2748b066a144cfbf8402174e2b8e70e821ae2c1553c4
font_01_sfnt_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 16864 bytes
SHA-256: dbc0c436fd7726a4ee79c9206dbdc841bf1a5b9e77244d9e70d6e7355efbdc1e

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