Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab6dd7d2e730950…

MALICIOUS

PDF

102.6 KB Created: 2021-09-17 03:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ff62cb3562a395b8a336bc9d564cb1d SHA-1: b5ba715143402d79cd389013c3ac370a4d395277 SHA-256: cab6dd7d2e7309501e70aa94e3a0b724661ce8b923cd27a43eaa7d4d048e9249
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://infrive.ru/uplcv?utm_term=180+square+root PDF link annotation
    • https://wedding-photos.cz/userfiles/file/totanavafunod.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/wivugezebedazudolimug.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/jezirifuged.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/damadizubewerubonabulip.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/marenujosomexig.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/12828696892.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/82297475026.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/jebotasun.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ul38shfn1guaojvru34p87ovs7/doxaninirivepiwilobune.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/32493336295.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/dezasasimofapumi.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/rozonulafodux.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/zimoletu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4si28arudgo1kld7sn6srvh8tm/62162827648.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/48360317753.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/54830228203.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6813965c8---76239484124.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109120259089511.pdfIn PDF document text
    • http://ducnhua.com/upload/files/32368784763.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/werimilotomovoxidubazo.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/nafowek.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/jikamipe.pdfIn PDF document text
    • https://quizai.com/uploads/files/latupafirakiwulaj.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecfa2acf35---jepor.pdfIn PDF document text
    • http://techbis.pl/files/file/bevukewomujal.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/butidipuxuna.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_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 20196 bytes
SHA-256: 68ef0e0f75496a56ac5fcb4798eb272f2f67b38d8864a9b214ac31808bf9122f
font_01_sfnt_off00015d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001756a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1756A 10388 bytes
SHA-256: ebaf86406d4899c6df1dd299e042148e7fc2cbcdda91bc58564757fca12c032c

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