Malicious PDF — malware analysis report

Static analysis result for SHA-256 0583409dc09f2587…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 02:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 640a3670a824069f0d7a814dd84291a2 SHA-1: a481aa5890a6bbe90ca966be382c7cbdc56fd7b4 SHA-256: 0583409dc09f2587b8bd80b102e50e0d2dd659d8cc84cf75ccf537af24e8cd74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress upload directories, suggesting a link farm used to obscure the final destination. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=employee+owned+companies PDF link annotation
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dab1c64ea---moxuwuvutefenafereku.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/buxelinikaju.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf8b4709f---83213718780.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e0421d680---gabivux.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5adc18b44d6f6f1ba9931b692851d045/renawipetaxinena.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4f0ff7fcef91c469bb8ead9e49a57be4/wanarikiwib.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8f5cc98c---33899032708.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160932d7857f6b---96914301676.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60dfa2c0a---25501485827.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16092735b48114---gapidosozire.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/31402620327.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/envegsm3t8u1clggg5lmb0tu8f/80473050845.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/19888843777.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/nezalutarikukubogabowala.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e6c020125a31eb407aa3d170d7e6bc27/wijazo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/zebejurirevaneripopofiv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vdvljakk37e8ig13fqss2otg90/sazuxunu.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/4206718651.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/90362840479.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/motobezorokar.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c111a966---sonugamojukiki.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///wuduvanaresisa.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/fofiwunowipeferamupulodar.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/33855509115.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_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10660 bytes
SHA-256: 0b32333921abdc87496dc40c71bb62727d803ebeca19c18d0a444b4569da235e
font_01_sfnt_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 17784 bytes
SHA-256: 7fe94270aea4b21e517c26a579b5d7a2aafaac6d3633f2e483cad083becfc0fb
font_02_sfnt_off00013f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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