Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dfd02bd335870b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-12 08:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4cd5bd8a55a73fa093ba069559ddb0d1 SHA-1: 9e1cc02db64eaf907148500717393289aee6d7bb SHA-256: c0dfd02bd335870b9a8ff767a55989d9559b45db18886f7840e656e61eff86b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories and disposable hosting, disguised as a free game download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://quangcaowebsite.xemlaco.com/uploads/files/75685246919.pdf In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/447656d0b8c96bf5620756c4583c1378/zexisuralugupebudulixikur.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2485f3027---47936080323.pdfIn PDF document text
    • https://wonkingchina.com/d/files/98516602738.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613794116011e.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/12952983580.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/43286926064.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/faguwavipevadep.pdfIn PDF document text
    • https://lecachet.fr/docs/files/23679981453.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/zewajuxumerozabikekigubo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132714fad946---rasaxili.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/94012925919.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/xitujoxarunolajuto.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/51255924537.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/zimilatewuziwirelog.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/rokiju.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/49472856175.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/mufesaduzemutowi.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/1627096115.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/lexigipokagefotujovi.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bokoligodogil.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c2caf328ec9159e25830184a27487c0b/96056310594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+v+premium+online+edition+pc+free+downloadPDF 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_off0000b029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB029 14368 bytes
SHA-256: 00890099c6b8e7fe3e95201eef84809db907589b5d877f7df1ccfed201fa3450
font_01_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 10904 bytes
SHA-256: 01ee38f92e0d9443f3b202c2bfc06d8af68c8bed6ccb766b641bef754fcd12b1