Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca41941252f2611…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 15:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 411e9735418dab1b864164755fd612b7 SHA-1: 98ac71c570ef06ba83afd80456bc288aabce71fe SHA-256: eca41941252f2611a1126890ddb8759395a23918673849378bb1fee160931ec6
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://telegid.tv/userfiles/files/tugegajevowemuxij.pdf In PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/82194165118.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edbdd49f59---libawabisixame.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/kurebalox.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-9/20210909213327558842.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/96e4a6af4eef53639187b7751aa453be/sagenepotujazo.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/710824098.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109022121026832.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/bifame.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/54115359311.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/jekepitewidamaw.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/nevawawamowivejigir.pdfIn PDF document text
    • http://ud2-140.com/files/30287753060.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/pokizeguribafararisunapu.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/tewoliv.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nidopezekapowijara.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/1150535230.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/nomokonuk.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6bf09ffe---badogedubumademigulunix.pdfIn PDF document text
    • http://checopharma.com/upload/files/29120597342.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/galevafebewar.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/buvenime.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/736f89f0ce89f80f7c4de0f33055cc34/tuvelimujibax.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f22e48c36e---fijejolijibimadigesoxeguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+stop+chrome+notificationsPDF 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_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 10916 bytes
SHA-256: d6169a3be636092a6f8f2e6bf43f1c6c0e63b9391e0d8e6915fffca2da96ff16
font_01_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 18256 bytes
SHA-256: 7862e844557cbe9f5802579edbe0d04639ea868dcad861ab108ae6ca4217c69f

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