Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c39723c057e076…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 08:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d63fa59e6c6497d31fabc119ed179ee3 SHA-1: cfaceb2dabe904e678811586b736fac5afe2cfa7 SHA-256: e7c39723c057e0764b5c7f40210f533f0161ad6534b1cf23d915bc1ab91189be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of external URI heuristics and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=among+us+mode+ios PDF link annotation
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407ab9977b1---kevotunilisiki.pdfIn PDF document text
    • https://kimcert.net/E/file/51773685722.pdfIn PDF document text
    • http://iccarrentals.com/files/file/relabodavokazejotifupa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd941cd80---53481986794.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/196582420861309f278a686.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/71dd5hem68f68bcutmf499lua2/43013543529.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/75164696628.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/82612055404.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/83285511174.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/33348978646.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/lefilosopapipokuxut.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/luzugoxalupik.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/38742996187.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/rejipesadanomasazevud.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/dabinusimosubawa.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/dupipazuxokenokupewuda.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/33610356095.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/25659817786.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/29207109563.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/mujenipemakeb.pdfIn PDF document text
    • http://shahgrp.com/uploads/31237186058.pdfIn PDF document text
    • http://esejsc.com/upload/files/32779546227.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/16652719717.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/76982903550.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/kopelorafaboturob.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_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 10268 bytes
SHA-256: b8b2ee6af907f4ba6bc7a782ae2304dc515160bdc084ee125049e4c074444eae
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 17948 bytes
SHA-256: 68f86a11af0981cfdc54b668c89a09d251534b7e0f391b6995ec8b06108b126c

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