Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4b152a55f2bf0a…

MALICIOUS

PDF

61.2 KB Created: 2021-09-04 23:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: b65a1f503d63bc7f869b07b7dc094750 SHA-1: 92dfbde205f9c519e0268671e1e50092f17f6e44 SHA-256: db4b152a55f2bf0a3c1e3f0dcaf3467be9162d0a2cc3ee14b4262b311abea82e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 5

  • 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
  • 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://allamericannursing.com/userfiles/file/28017559683.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/im1a0utjfjd08c03ej4tt6occc/95562247401.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3b63f69e---17867678218.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/fudaxipemo.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210903043034.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dfb220fce---37492898190.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051302210673499.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/14841654616.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/pawitasesarivesedo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa910f3b0e---sezudumogo.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/xamasafenero.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9866k1ns1nrc9q24ov0tloecj2/45494111465.pdfIn PDF document text
    • https://belloverde.net/emailer/file/75054105889.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/balare.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6ab8552b85ff20cf16866e9624a43df7/lonokaranexoma.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6dedfacf---towob.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f574e4824cea2aaead5ddec38cb97fe5/jeposodifupudekupir.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc311f979---58473542524.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eb7db79a15---97876141178.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/39806692348.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2bbb154af---subedakezanasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=four+types+of+sentences+practice+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 10756 bytes
SHA-256: 896eb1ed037596dce592439e3e833ca9764828a80e2ab7390f230e1b24c10cf7

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