Malicious PDF — malware analysis report

Static analysis result for SHA-256 5576f58223074c6f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 20:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a944150be24ad9f183e43a01a63432e2 SHA-1: 2a2cc0724a109c80b76611756c5c1ee219e0e943 SHA-256: 5576f58223074c6f61c6c9bb9701312e03ed59ef7997ff3df2898c0561c056c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://villaelen.it/userfiles/files/gajemon.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/imf7505okr9vgj2ieo47tdj3a5/7534166650.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/46103805863.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/pitepezibovifoki.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/62938322965.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/21919806368.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081971c1adc0---45402251315.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7ee5ea878---29216585607.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/26599016076.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d5f3faa787d7ba8489bc1df22ade1966/vapizufajikosufuv.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/movagujilewalevisor.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/raposefupezubugume.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3610fa4e02537a68a79935133f522f07/jomozosuwujezemi.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/fikodur.pdfIn PDF document text
    • http://metallpress.info/files/30789896231.pdfIn PDF document text
    • http://sireny.net/share/files/jipilorus.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160962db152233---jegadukivut.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/rarutumevoxulurewoma.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/52066900524.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/51151101306.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/74264504359.pdfIn PDF document text
    • http://debden.org/userfiles/file/29205803376.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/dapesodulu.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/wojux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tissue+engineering+research+paper+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_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 10700 bytes
SHA-256: 176f8119937218131fa7bd74fb6ebdb77d731ee75feb940f12b7abe2d53f2e5c
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 17980 bytes
SHA-256: 3cc5d26512156f3121fe854ea0b542a466ea26aedde8c55095a1b008ed7dd920

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