Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd37ad7903163117…

MALICIOUS

PDF

93.0 KB Created: 2021-09-07 03:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: baa0d16a4cf440268e1db39a5aab5dd6 SHA-1: 5767979935d254a59849c6aa5b83d87a04213575 SHA-256: bd37ad7903163117e90b52cdf7edbd82058191f05f6138c04dc961d003fda861
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure victims to external sites, likely for phishing or further malware delivery.

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 https://nomylo.ru/uplcv?utm_term=film+budget+format+pdf PDF link annotation
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee5953d73f---maginolagalekufal.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/finuzi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/63784006741.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/68510762925.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/t43v1d0u0ajepte6jjj3pa2nbn/58837513952.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ec1f48204617fc4ac2f8d0a8f0574ae8/21074011449.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/61340468609.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160916db9a66aa---vumadibofeki.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/tutogerud.pdfIn PDF document text
    • https://fond.ru/userfiles/file/gekifumijaxirazemoda.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/duwowi.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/vipexirawibolemo.pdfIn PDF document text
    • https://kede.org/userfiles/file/pulafuga.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160775f707c337---jadewo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f2ee7edb---jivopalidipeta.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/nawixiwojofabomosi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/88875598941.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d39e9f95---rarudoreriw.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/29902502280.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/89365997954.pdfIn PDF document text
    • https://ckmandarin.com/uploads/27080736702.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/dozenovofox.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f651398bb9d---jixovavagewepaxeni.pdfIn PDF document text
    • https://ccskin.com/geektic/files/86804170158.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/15119866692.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1376e72da---70220889496.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_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 10784 bytes
SHA-256: 4d869846b966966252db602f6992879385ed812fd17f89baa10591ca7e15d29a
font_01_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13698 18208 bytes
SHA-256: 459ac81944dc745343ee108c6126c33d9cb87e0fb73bd951746418ebd5a6e5ad

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