Malicious PDF — malware analysis report

Static analysis result for SHA-256 f797e99928b03492…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 02:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c819cfb6fe7043189f4635277671e09 SHA-1: 1eb351a304c13493092f05128f34fbd67276ad18 SHA-256: f797e99928b034927f2d384f60f53f72f56bae2bf2bd513c37dc9ba375808b8d
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 features a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://macierz-grodziec.org/files/file/vogodeto.pdf In PDF document text
    • https://anukulagrotech.com/userfiles/file/23484788475.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613534fb10381---51093332057.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/xogisokujopemimab.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vopanalop.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/gadubixebivovesibasixezuw.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614183b5ca1fd---90966185813.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/32085407255.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/musadodoj.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/robarubaju.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/64295034214.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/8433937901.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/muvenarotonarakoriziposo.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/94661960498.pdfIn PDF document text
    • http://ibshospitals.com/userfiles/file/kuvofukusemujopa.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/gegozopewefawinilawuro.pdfIn PDF document text
    • https://renetravel.ro/images/files/fawapakuxi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c8a56c14e0d8404fb0c76c0e28cb7bb4/52526272634.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161414921be56e---90461030823.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1880301580613066ed909e5.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/nubedukuzofapi.pdfIn PDF document text
    • https://maisonforville.be/documents/file/zafolikapubuvuvi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ca3b34u54ts46qa9q96124fnrn/nedelofuputo.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/nuvedaxulesopuwiwako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=google+play+para+android+apkPDF 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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 10544 bytes
SHA-256: 160446950614569fc71c75117db401679d970140a8df8329edb9b621082f5a70
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 15780 bytes
SHA-256: e5c54398cfcd62ec4c2a9a1bef628c83fb3b1fdbdff15e6f8cb5a9c1eb31d5d3
font_02_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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