Malicious PDF — malware analysis report

Static analysis result for SHA-256 30faff5a4f52d96d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 20:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e7b5f530b5138f4e5dbdb8585dbda93 SHA-1: 8d65afee2146eaccf9c89c24e738d04395263103 SHA-256: 30faff5a4f52d96dc7a3584c080669cee9c655e313175bc042f4bc827d131e4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and link farm are used to redirect users to external sites, potentially for downloading further payloads or for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/aiqbaoc8ai0p9ra0gactgs3mcg/32095040545.pdf In PDF document text
    • http://centromp.it/userfiles/files/vopuratefujipofox.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/gunomeligonoru.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/fumuzezokowosuvur.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/jerilov.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/90561303761.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210911073740476.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/nudimuxob.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305c1a745c3---tosiditazejose.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/13958440939.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/912714222.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9ef459dd---rimomoz.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/23606185041.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320c57d3e2f---70043335254.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/87447569632.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/ranamurexa.pdfIn PDF document text
    • http://hexindechem.com/upload/files/51479655390.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/fegemojabagigumomijuvo.pdfIn PDF document text
    • http://timebymtm.com/upload/files/wetirajejal.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/koxolaxijigoma.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/10080222061.pdfIn PDF document text
    • http://hejia-ele.net/upload/543532080.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9844449578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+demo+download+androidPDF 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_off0000bad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 10500 bytes
SHA-256: 2ee0828e5470e325e125b11f5fc17083b5a372843a616875063568c58f325cc6
font_02_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 16916 bytes
SHA-256: 971dede2c25acabb22883b4033e145262215c43dbe83d05d11624d841c707a5b

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