Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf8a0a4fce3a5b1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 11:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae291dbcf51f2bd834a32ee058ab6e98 SHA-1: 29f057dedc39b1bd092a81778284437369a3d1ba SHA-256: bcf8a0a4fce3a5b128050148273c7d03956e10d32d8ff2e17d31ca7fff745511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://vntdc.com/upload/fck/file/kolazabazaxofuxadexomeril.pdf In PDF document text
    • http://gardenofsound.com/userfiles/files/seliriwugosisesuniluvep.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9366f90e8f---rarixigizopufesiz.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ejqi9ifp3aaid1ieob0v63paeb/36363746844.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/11694011578.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/goziwesuvavojetejatidisuv.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/55266119499.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/74930957188.pdfIn PDF document text
    • http://usateatop.com/_upload/files/63746349493.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/1284932162.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/79433519660.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6ae6cf64b---waxusivitawuludusezukudi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090cf7abc827---sifuf.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429222818395320.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/83831325769.pdfIn PDF document text
    • http://annabarons.lv/files/files/kamoxararonuzovi.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab51906b4---rajonakave.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2da9489f1cb5c6a3c68ee297f3a768fe/46727532881.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805008a9310---fudesedekotolesokag.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/tubesutelodikupevoso.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/92427412551.pdfIn PDF document text
    • http://philboyd.com/xiwafufikuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=finding+spirit+bear+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/35109442286.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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10624 bytes
SHA-256: 49948ee6e9b452211217da9bd944c3e43401dea8daf452bf3e7fa2c55dfe5f90
font_02_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 18048 bytes
SHA-256: 089f4130cc4583ad5fc9b1d40ffa1b2774a166486879a83bd9266c8c496e5b64

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