Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d8bd1f39484e6a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 06:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 96cde6d7d22df774a031c91c0eb2c84f SHA-1: 6351495be9513d351795ccdac63e63895456cca1 SHA-256: b1d8bd1f39484e6a1771d38755f06962edf36f5e43a35ad6491ba53a57ab3852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://zulassungsdienst4you.de/bilder/file/ferivefexuromekizawet.pdf In PDF document text
    • https://huaku3c.tw/uploads/files/202109081848375575.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ej7ihdu2gt81p30gr8330g9gcd/naligujir.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/sobebugati.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132702db6f21---12819245659.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/jarovawajafiguz.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/c3b604netp5v2m44t8misptr44/62496567425.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/4203594368.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/97633622535.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/19911695829.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8d539fe7f24ea1f321bfbb593dee2c28/82092154551.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/rurujuvebiwo.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/gujiriveluxuxerata.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/93269235981.pdfIn PDF document text
    • http://zgic.ru/!upload/files/21437282336.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/89698061956.pdfIn PDF document text
    • http://fnathservices.com/upload/file/66192328224.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a77caed89---51820995325.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/26652469873.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/29803462222.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe104c2a1---pixekav.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/75489108600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=xxjvu+firmware+free+downloadPDF 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_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 10740 bytes
SHA-256: 36ec26ecda2f395dff48ce9337bf2007ea2a028f22f2ebe0b44ed8fde266df9c
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 18092 bytes
SHA-256: c891406465d684e847e3301bd9477f3016d3555e5bca3962263f7af32bb291d6
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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