Malicious PDF — malware analysis report

Static analysis result for SHA-256 a709e1b557c3b07d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 09:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3d81a0383fbc4f6aea57fab0804343f SHA-1: 2737e1a935266c5baff6ee65b61964ce2bf27798 SHA-256: a709e1b557c3b07d1cad3c1768a511217204802a702b8f973fb6fb831f54d24a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS upload directories and disposable hosting. These elements suggest the PDF is designed to redirect users to malicious sites or facilitate the download of further malware, aligning with phishing and malicious payload delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=how+to+update+android+tv PDF link annotation
    • https://honghow.com/ckfinder/userfiles/files/92035697666.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/15809157627.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vigunog.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/49472856175.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/70484125192.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161336ca70100d---35779658713.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/77526498065.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kabikubamaputagikudowo.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/gulakuxekek.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/81450419026.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ni9aq9mgvdconf7tsnci0dgp90/4875495741.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/43223427378.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210901173243.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/22021478117.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/mawutuger.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/14514881755.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/96998463697.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/sowododuwebivow.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/nenugafetuwumadunen.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/tanaropamewukoxifan.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/femudu.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xepopagawibemewo.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/34179932794.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/xajeresenog.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132459e117e8---jesewotu.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_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 17192 bytes
SHA-256: c723389e5d8b17cdf0f2fae0dd02f58a3ab069854d21fe1d925e5e7aee62bf78
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 10412 bytes
SHA-256: fa202e9ff278967dc6ac4c2e876020dd449828625f75b247b45ed9faabd94ea7

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