Malicious PDF — malware analysis report

Static analysis result for SHA-256 f593e8b541bc5e01…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 17:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 627fc91d96c06abdcf44943e0bc8c204 SHA-1: de2ec9160b9eb34e4b1117688f93201c526e5356 SHA-256: f593e8b541bc5e01d539ed1ee24eb4ee3e4bb23dae4718a831d48fb989c9b4bf
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=chrono+trigger+ds+rom+download PDF link annotation
    • http://bdsductri.com/upload/files/sukeg.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/xubalalatodik.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/45945519893.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/20251328726.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/rakorarofet.pdfIn PDF document text
    • https://bloomeng.com/uploads/kolopav.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a603cf85315819a18edf3e3415397348/dotugudapawa.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/20f49471523b5a8b8378119e1abd84d2/47306674222.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/62914871222.pdfIn PDF document text
    • http://eternaseguros.net/files/files/40775357709.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110918456188.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/01c19418828fdd620acfd6b301d2a15e/pogijuvaxadatereniz.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/55333765794.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/poloxemiweb.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/824517925.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613521f956eaf---sosubepivuzamiteneti.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16137944c73d4a---sevigata.pdfIn PDF document text
    • http://wernitznigg.at/files/natesexoketatibumodotidu.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/xojapojig.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/33806154784.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109131724562761.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/73719346367.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/8785985657.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021931819277271.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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 17952 bytes
SHA-256: 29de21f10cb7462bafca1a695ee97a76d4a4e40e121edbd0de129e08696296ca
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 10812 bytes
SHA-256: f9e34c517bc04260f8681adc64d1b70fe63303094510b7356656bb576b8cb6c1

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