Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5789f1ad40a5f14…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 15:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ec96e66c8985de02d3fdfe297de420b SHA-1: b06cb5f45c3b3cfc5afcafcbc47a0ce84a818eb6 SHA-256: f5789f1ad40a5f14cc547aa30fea174debee8b4ca4f001039098dec4f83a9c35
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain executable content, but its primary function appears to be redirecting users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=br%C3%B8dre+2004+watch+online PDF link annotation
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47d3f1e45---6836908648.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/morunatedeg.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/5559173814.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613583840dd2e---72635937375.pdfIn PDF document text
    • http://fertilizerproductionprocess.com/d/files/lolibiperawanig.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/590d5593e88796d6bc23deb158b4d258/68446013994.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/20041178106.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/57041152060.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///86259826846.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/41165913433.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/kadawufuzigasok.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/jagigajejesadaju.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1f435cd32bbf707d24acb432b49b455b/91480284594.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/41623000589.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/1299734678.pdfIn PDF document text
    • http://lejuriste.ru/files/file/pivob.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/59297440320.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/10390268356.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/91731523416.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/xikugulifuzesadu.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/xugibesezuvagi.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/54229899442.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/62003215184.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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 18364 bytes
SHA-256: 05363eec5fc09bbfc017a28ab3f5670d5742f97f1269d3120310121a8e2742a4
font_01_sfnt_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 10936 bytes
SHA-256: ff4d555bf1b78f1e82eb0f7041f553be503e0e7e79675195d32d50ee0c8ef099