Malicious PDF — malware analysis report

Static analysis result for SHA-256 47aa168a3a19411e…

MALICIOUS

PDF

93.2 KB Created: 2021-09-06 13:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 696529323bc072357ca926a724e9c7eb SHA-1: f94a2f084825228ddefb9c03ac9cf7866b633759 SHA-256: 47aa168a3a19411e8c90bf4cc4792d88803792fb7e95caab2a41f57515a8acd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://mg001.cn/upload_fck/file/2021-6-4/20210604082952404720.pdf In PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/pizurokidotimevuwazej.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/denivuwiwafizezeneru.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/74696358626.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/loxozomilax.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/67607729988.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8af2d1c0621af517cd5e13c59945d71f/nemanewaruvudami.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/pobivebudojefor.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/25391279545.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/titetomedifovudefawe.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab24c4dc8---92487409147.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wupiravadifirodojakuruf.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0ej8m0eadriskrpn6j2b1fn4t3/49476538151.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/kokaferiku.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/4864616703.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/35960007868.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/59520987200.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/94849980731.pdfIn PDF document text
    • http://planbmedia.hu/files/wavolofinorelososogugulu.pdfIn PDF document text
    • https://anfauglir.com/images/file/puvovixotagilesiwazodafes.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd8b48c38---91252061428.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a14956b5a---28459061906.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemolerovoxawiwebug.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/20b433cf522d55309c75e20500094829/ripawadadazilogevufuvexu.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/59353837714.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/74742076325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pembangunan+ekonomi+dalam+konteks+hubungan+etnik+di+malaysia+pdfPDF 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_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 11292 bytes
SHA-256: 1fd377c0b8965d268a14529dad4860ffce3dc7a8f3b4497989291ca886827207
font_01_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 17484 bytes
SHA-256: 5dc82249488635c2d20f59ad54ab18153a64098d87c3354c44b1e1bdef2e1e31
font_02_sfnt_off00014e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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