Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d5a9ef28b9931d…

MALICIOUS

PDF

112.8 KB Created: 2021-09-23 19:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: edaa57af0f55abccdf52e983d5c0ea8c SHA-1: 21458dad1a7b0a25e763233c0e9759a326c561bd SHA-256: f5d5a9ef28b9931dd3e3d02ac06ba7fee5078fa55e186fa59b02e2440fe046db
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=paradise+lost+book+5+pdf PDF link annotation
    • http://qtjdb.com/UploadFile/2021/09/10/file/20210910_075917_107.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c89091aebbb2efac1faafd420650a98a/bagizabi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135995eef560---5606883262.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jorokivazojomok.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/nujafonorubugenimuwakad.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/javepetafafajax.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e19c921d---fojigizilokive.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/4841940730.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/dobawu.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/78932901830.pdfIn PDF document text
    • http://marketingnews.fr/images/file/duxitabejetutajedukid.pdfIn PDF document text
    • http://wawa757.com/uploads/files/87398856742.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/99885368661.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8424afa8---17749661143.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/24936368873.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/45756439360.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/70680448988.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/24932862267.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/berejuberuzadusabesi.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wiselafo.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/kexabip.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/funemezowaloteb.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f283b168d23e1bb1a9e5370739106b32/ziwipimoxizodonivipifaved.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/9f6effb0cfdd1005b2e16a9a47d09a2d/12988947196.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_off0001578d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578D 17668 bytes
SHA-256: a56210c9319d3c2d4d9eda80bba2e9ca64956002a4ac9bde0c19df60a4f7839d
font_01_sfnt_off000184bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184BD 10752 bytes
SHA-256: 88765e9947a490112e89b135a98af23f152482cfd12f871f5b9350f7ca922780
font_02_sfnt_off00019d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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