Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0379b7a5f636f23…

MALICIOUS

PDF

75.9 KB Created: 2021-09-15 09:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7f52ccce6c6925332cb8e1dce25e2ae SHA-1: 71f29b6d49ce1f2141da41efbfde6548c76eb248 SHA-256: f0379b7a5f636f23de1ded64091823f8114c789c41ebdc7eec4e200409a58a2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=t+point+apk PDF link annotation
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hvec41hor16bbrgu9m1kaj6pb5/jerolifosinoses.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412f80ec4ab---wanowa.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/vupatipepojalivifuze.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/kusulonuvuruvulabof.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/goluxinukazetikesu.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/20403760084.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/jafijukitipaxiw.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/57236143799.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/batibimuwowegi.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/nasuguriritasapivo.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77643777944.pdfIn PDF document text
    • https://masukpt2.com/contents/files/14027505285.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/zulufukadesaratosodo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b640676a10---67782648521.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/bukotizazamilolojuxe.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/e3escle327pmg5tgvmgm0o3a8d/69881465266.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/25286718341.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/falaregujukikevexa.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23f52e3e5---goverixog.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/xenewamobakuguze.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/jufusomiroxopekuf.pdfIn PDF document text
    • https://kede.org/userfiles/file/fotukitaxipoludexopep.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/nejuzumafimonomokaroso.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_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 17532 bytes
SHA-256: f8c9d3ca28e4810042821bf8cd0cb4e9206390ef3b96e78f52906940944ef058
font_01_sfnt_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 9856 bytes
SHA-256: 53ad733afd6b4f5a5147406a2db25be2c5c5d3fe5b14d347d5ad2e08a8e3ccc6
font_02_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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