Malicious PDF — malware analysis report

Static analysis result for SHA-256 338bc8dc53281ccf…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 11:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 559407f64ca7a8005478e551a36dc716 SHA-1: b52787a4fba7ede3a6f2517f75d624401916ddaf SHA-256: 338bc8dc53281ccfc9b65d20cb45edcecb9d294844ca2db2dfdd311158e5ca71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=castle+crush+unlimited+gems', likely serve as lures to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=castle+crush+unlimited+gems PDF link annotation
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/23863579867.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/99123100200.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/jekenexitisuromuzakarir.pdfIn PDF document text
    • https://n-tlg.com/files/file/fedipulupejojaj.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/88322038347.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/42211700085.pdfIn PDF document text
    • https://esvigo.com/upload/files/bofutuwepegopole.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/wibumakiwabapib.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/mudebevukibuvos.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/37338251297.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/38658640449.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161363f42e3f16---kuwipalisosulelazotobu.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/bakaxatewalo.pdfIn PDF document text
    • http://kd-council.com/upfile/files/zonajud.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/jixir.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/jisamigurulox.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613580f2d0566---40679739723.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/gugupebavagelefafubowilit.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/nekixodufijiki.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144204ba69d0---28523552615.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/muxedowoted.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/rizagufapese.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e079b681f0---marivasi.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/katesurawelenivaxiwukefa.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_off0000ba94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 17004 bytes
SHA-256: 18fc4857a71f31f61ded81c5d798af503cd5997f369a319f20187884ea326bf6
font_02_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10828 bytes
SHA-256: 9025fa7fbf6c2220d3d324597071fdb5428de68dfcb7be21fcc09cf3cc3c0440

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