Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba4278046251951…

MALICIOUS

PDF

95.0 KB Created: 2021-09-10 13:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ceb48f7b5d3c678ca2c54f40577c2fc3 SHA-1: 9d7618652e6726f2c3297fd4bedbdcd50f245748 SHA-256: cba4278046251951bd34bcfa77fbbba0a0bca0763679c72aea145bec9c9b75ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://successstudio.net/userfiles/file/pipiwerulaleledig.pdf In PDF document text
    • http://carlaschroyen.com/content_docs/wikirogasidazububo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613491e1023b4---76349969841.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/87361231475.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/wuselugirewosibuve.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/49334702165.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/14606396748.pdfIn PDF document text
    • https://cristalensi.com/public/File/98621520051.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613304192e68a---99198599375.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/73374805523.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134b88263882---56589011941.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/35111376623.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81da639c6---86750118039.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/99065634208.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/jadutinuxe.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/razarasigitelevugalenik.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210907113354.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/widadojevanudixuvulis.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/zafivuzituxenapugirotere.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/47537092916.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/vuxuzalitereviwipemusuj.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffe12dadf---61309465050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=under+the+same+moon+full+movie+free+english+subtitlesPDF 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_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 11116 bytes
SHA-256: 093156c3bc56301e474c8f62d098e29113099c5ca714c12baeaac1674e582707
font_01_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 19652 bytes
SHA-256: a7731bde959903f5045d7c52e99097d9ae063d561fab0435fc36d41eef0527f2
font_02_sfnt_off00015693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1