Malicious PDF — malware analysis report

Static analysis result for SHA-256 52536d0adfe7e1a0…

MALICIOUS

PDF

120.2 KB Created: 2021-08-20 15:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c402986f91694fa0eda8b50a8ff4efe SHA-1: 7121831c8a52c0a67717a7d1ec49a50fb51f88b9 SHA-256: 52536d0adfe7e1a00d6df6bad788608674a9310079091fab6234764cac5fc350
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://pixomot.ru/uplcv?utm_term=how+to+get+minecraft+vr+on+oculus+quest+2 PDF link annotation
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9eb71dea5---tazunudojopobonosi.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/31417141750.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/jidepex.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/42153165406.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2febf724---15036840507.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fajasodezijilubaxukexeb.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-21/20210621041208657953.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/bozenuki.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/lizafujitivoxebu.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/hkkhb7uvr69dfh7kdvmfega18d/97011477180.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/gigisitowibesoduduzezami.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/11563237483.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hhe81mflplful8vu0qs0fdaqml/95500832198.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/dogatefiberuxuvakawuv.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/670c94201d212237896b36331eba366e/nezasisurutowa.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/joramar.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/64882197744.pdfIn PDF document text
    • http://donghotam.com/luutru/files/rojiluvisavudepafazu.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gubajadulafodinujemajaza.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/gelugago.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608053cb6ca1c---kotubis.pdfIn PDF document text
    • https://sapporopools.com/contents//files/bizoxuni.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608976420d92d---zulolokanivuwoxoli.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/xediwiwudapubakijuku.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jitesamigonunegiputuwel.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c016ac04c164a66571372aa42e9a7a1b/lamirutexupevus.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_off000172ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172FF 17240 bytes
SHA-256: e50d4ec8a13f1905331719fec2ed1fdc6afa2708826b358562919644ebd78b48
font_01_sfnt_off00019fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FCD 11188 bytes
SHA-256: a2f11afc0897f23e9825cd088f87c21c8f3fc86d7b32cb2f487155deb88cf4b3
font_02_sfnt_off0001b9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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