Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce514523705ac7…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 12:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27d5baa94faf649c1ab69db081496186 SHA-1: 1b469c28e43edbafde2bf1793ddc3d69fcb6b6eb SHA-256: c4ce514523705ac7b2f327e255197e7fc9d76732ad58ecd674b91b7c7a067e0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://naveenent.com/administrator/imagetemp/file/xukunakidebubatatelas.pdf In PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/nezuboxizoxo.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/7500565226.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/sodufamo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j79e5gm1945pponj8tos782tc4/tikikizevij.pdfIn PDF document text
    • http://goldmustang.com/files/files/leveleresawoj.pdfIn PDF document text
    • http://askaudit.ru/price/xajimuwivirolazupazabidiv.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/genanolalufosonenuxoju.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/fidunowurekokosopuso.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/kajilujavisepibife.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/wukogufenosefofomukixuzan.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/99940817412.pdfIn PDF document text
    • http://regmac.net/userfiles/files/24455136713.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/pazidu.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/vikoputusoj.pdfIn PDF document text
    • http://delve-cr.com/uploads/tazegamarugigisegufuji.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/58083651798.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25d363e87---83132523969.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/9683316019.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f55653d79---66207638972.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/visur.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/41955921946.pdfIn PDF document text
    • http://vodnik48.ru/content/file/97331913221.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/rc3arviqmi4nn47m9bvcsfu46q/wewogefonixefa.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/82652526026.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/48483246642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+root+redmi+9aPDF 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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 17844 bytes
SHA-256: 41e324b8ba15fead810d55b2fc11d5709e504658faa0f5289fde58f23ca7bfb8
font_02_sfnt_off0001174b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 10336 bytes
SHA-256: bbe32637ace539a1b8b50907e1f510f1b5fc4d1070399774204cea65dab96f63