Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc13277d0b0abfa4…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 20:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd4dbe3130689b9a3d08632a4c8df028 SHA-1: 3c90b1546a92c1e9bccf2386261e50c6ab40b4ba SHA-256: fc13277d0b0abfa4694179c49a9604321919d88c4a568cdc64cc4e2acd6598fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document contains numerous links pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oriental-kitchens.com/userfiles/files/lipazugubosagufunapuko.pdf In PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/35472195353.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/kiminavekome.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/pukexofuxif.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/sabuwemumutugadepixuvenik.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/sofupizeg.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f3e576211---54340963411.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/ramilebag.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/vufevekerifotojuxowewef.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/98295178445.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/83710170696.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/76311332497.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gufavofubanulogonosi.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210630115730194.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e50d0130f6---93083725126.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/kuginuwuve.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/gofuzobuxaburep.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/bebubolanitovu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/eaffc0dee51aa9077f7b61a3280d66d2/bojugezoxaxaso.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210823104927.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/djvnqqs40t0npn74op3i7haphn/52426322655.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/53970273657.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2561979d44f15e5f8af65fabf5ad0f01/75526324633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ntse+sample+paper+class+9+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_off0000c85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 10608 bytes
SHA-256: 4437701179c87f9e32ffecd3d3c1d893f0f0f2095ef9ad7ebc3e3be826081dc5
font_02_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 17856 bytes
SHA-256: f1e472f174010e35709e563580749aa8cc5915f26945802a6d4d9d9f92a87b2f