Malicious PDF — malware analysis report

Static analysis result for SHA-256 973b8522f35fafa2…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 05:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cb54520c8aac7cf8a4f48f67d6cfcb2 SHA-1: 260445f45dc98afc6b76458276aff595112c87b1 SHA-256: 973b8522f35fafa2340ac61129933b2bc068fa82d0976a6e2df9737aed8b996b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination or evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.sacict.or.th/ckfinder/userfiles/files/voxexetilujufafelenulo.pdf In PDF document text
    • http://artin-intranet.com/ckupload/files/56484196405.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/70992306122.pdfIn PDF document text
    • http://nincity.de/inline/file/gumegakufasi.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/48187073283.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/xawakelemeta.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/demax.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/masivixejedexabovutore.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/gipofibomelaguxon.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-10/20210910160028120497.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/fufurojis.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/tifebavi.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4432410708.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/96348768466.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109121803585297.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/ronigi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1eb1933503c5a1b2debf447ab4115549/32351855363.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/bajapinixone.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/rosojasikufidawakolo.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210902140507.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161347b4c5ed0a---jurevanodafapipupalen.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416541c57b4---mazelogazuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=a+quiet+place+watch+nowPDF link annotation
    • 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_off0000b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 15532 bytes
SHA-256: 58c830a95aad1e127760d43948f3dffba80f3701f7203ffb484cd6828393a6b4
font_02_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 10516 bytes
SHA-256: c2913710c8ac4ea81792b5772d706ddc66b876eb584b974ba32c6ad7fdd8f386

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