Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e669cb04137bb52…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 12:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32ab2d6f64a795ebc749d0f6afb35342 SHA-1: 1f8a64aa6061ebea79afabe04d3a28051baebf20 SHA-256: 4e669cb04137bb52e2fcb527a3eab772591948b3ef076944902b48c60cc3be6d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.jnvhardoi.org/ckfinder/userfiles/files/mewatabili.pdf In PDF document text
    • https://godahoian.com/app/webroot/upload/files/totoregovirogonenejumimaw.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/femut.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134db9c1f533---9361353567.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/17902966714.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/wugepokutuw.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134edf82ca70---gitomoga.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/wodobawezapusupelegeruk.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/36021836970.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/45146404224.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea8d2a92c---87912790080.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0e9d88824a272ffe1b9653b61342b7e3/dazosa.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/44084785859.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/bokotasevukukabevepezo.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/namubutujigapubozajopaz.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/lusasakoj.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/29531513914.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/lutuge.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/79475269064.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/47993568803.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/1431324329.pdfIn PDF document text
    • https://kaparatt.com/images/File/62375149182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+joseline+cabaret+atlanta+season+2+free+onlinePDF 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_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 17500 bytes
SHA-256: 0f7ce6f5555dbdb9bc8f0557b0f367dc7cbcc3515833515dfeb9a9ad2cea9ece
font_01_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 10816 bytes
SHA-256: 0070610edece476db511e5c8c8ca22f8b4a3c537ed55a8ab9c15e0b6932881b8
font_02_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1