Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7e74f6cdaadf97…

MALICIOUS

PDF

81.5 KB Created: 2021-08-12 12:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c55bfdc58297fd0b2c98584f7295528 SHA-1: fab9669f51acdc83f33a9209a050ed74e7d36b82 SHA-256: 6f7e74f6cdaadf978248d1d06f8a2856dd499f76eb9d8ca4265f0badb9b8eeac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites. These sites host further PDF documents, suggesting a chain of redirection likely intended to lead users to phishing pages or download further malicious payloads. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/84454b44ac40f884b68aa99f164df5f1/rugomamutetuwaru.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/04a581e93d9d8d2de95392ba43fc8b33/782204986.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xotexukugamelen.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f2830745---32711493947.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/13142273a4d4df26fe800aded6713e1a/bipexesiz.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/wamikaxalip.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e520ec8fac3e64e387430ff9ea1d422a/86353303960.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4545d3ae76---31739770799.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609143d1e6577---563503634.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/mekos.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210810044348_evp2kv.pdfIn PDF document text
    • https://petala.gr/userfiles/file/43145720197.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/pgohm86hfplepjit04lttn2nn6/79106695084.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/62141053403.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607044bca2707---visokuniwolenaje.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/sekusuzorilagasaxaxudetuj.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/5672744822.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772bb525f58---biwupepobafumepojometam.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/lasolanunofonasaninex.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/nifatadonesurefumujovemun.pdfIn PDF document text
    • http://c-amc.com/upload/files/supufibilifigikodotatozob.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f2d3aa8f3121907c4c1502424fb4740b/22763605003.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/2722158694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=shadow+fight+2+special+edition+mod+apk+apkrealPDF 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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 11440 bytes
SHA-256: 6c6d79d55e3894c9bda21028ad44c9ba477a8891d752ce33ba752e4bfb07bbe6
font_02_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 15956 bytes
SHA-256: 521f06903a050410dde23b3ae4c9fdb9494cd19b8122d6b45e0a979f19a8f01a

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