Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bda44afe7bd1e8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 00:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92a96e05ae44e1aa2323dab49f86a3f5 SHA-1: a5f3209674d0cc782ece3dabfc220f67528b7e9e SHA-256: d3bda44afe7bd1e8e10d6f0e789fdea082c9e9a99a2bfdf31f791956f04ed030
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous links pointing to compromised websites, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the redirection of users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=hiv+virus+life+cycle+pdf PDF link annotation
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160740c7b028b7---pabewira.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/f0953537f8766c98e97c67065ce389d9/wugomatu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-12/20210612071552933686.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/49a95b335fc2de767a2fac279588994c/perokura.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/20271309624.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/kaxiwatoruk.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8b5b5a6d8f0e66fbfc87b0cb2785b615/12328685375.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/rusenavek.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/80632277143.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bf628caf8---27960755650.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/53838096256.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/8740021962.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/78559043545.pdfIn PDF document text
    • https://airbays.com/userfiles/file/bonixobobewiv.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/minevofadawumalu.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/ropedifozasedizezatenis.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d656dd50d9---mefevejoxepizuduruwewajez.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acf0d4222---63172939914.pdfIn PDF document text
    • http://ruresept.ru/files/file/34826405789.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/23612655612.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089057471458---55345093501.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/92300804339.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/zoxubujogafudo.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/6900302495.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/jerunevivojuranepizuba.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/25967437777.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_off0000b9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F7 10400 bytes
SHA-256: 3135770536bcb6a4e9bd05b0d24a03b43cb0b93c2a048e35b07b96d3c887b589
font_01_sfnt_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 15644 bytes
SHA-256: 1ad234755ea938e3cf5c0e48cdf2ad2b5f013146cb8bc75b4159b7a25146f3ca

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