Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e078211eed36217…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 13:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e62ce0d46d43879fde3d7f1aa92226d5 SHA-1: 65015a64d2ffc7b722df9e0879150e0aeb99c83e SHA-256: 6e078211eed36217f2e1f2d172a67f29e50a18a871547efd14e4d480a4ac6ce9
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. It also contains numerous external URIs, including links to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://laborke.ru/uplcv?utm_term=low+space+android PDF link annotation
    • http://tcsklife.com/filespath/files/20210910120259.pdfIn PDF document text
    • https://atrax.hr/files/48960526431.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/fenadalemadavogaw.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/semixuxejabatigewox.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/40703886698.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/58519862788.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2b4804800ea1d2ddcf005e0348cfe01b/vununakepewipomugujom.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ah76uad9nfeoolvdsjn65b9os6/pefubemonumowulumedaf.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/34091292619.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/81011434253.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/17223868154.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/kawiroziwodariwok.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/84720207065.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/miwuwajemo.pdfIn PDF document text
    • https://lecachet.fr/docs/files/dodelodopakavebivix.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/98239010531.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/jajipaxavifoxutudim.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136180f7b21c---3378998681.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/77870511507.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/tuzam.pdfIn PDF document text
    • https://mihalex.by/files/files/vivinevituzijenux.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zavevuna.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/pisovulifinomubapitovatub.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/wanetakekex.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/wepebufiregu.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210917054912331241pvd1j53v11me.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_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 17532 bytes
SHA-256: 706306836782cce51984bc576208f4dca8807c46ba78a27d2490fc0f8e9d75a5
font_02_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 10408 bytes
SHA-256: 07c2f8d333cd8a4d6053a157e8bf6646c0e347dc45ce384f7306e8b134e2deaf

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