Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcbcc3b7876ffa3…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 05:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c59b8a83fc12d98b010172a0d9b05f1a SHA-1: 7ae8292633ab435a89f24b1e1452f33f3c5bd7ff SHA-256: 5dcbcc3b7876ffa3d4c27181ff43124a441fcb90f518da0699e8f7fcd393df96
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://architettorobertafasola.eu/userfiles/files/joxirinugalelejaw.pdf In PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6e0640170bd01c0a140ff98b36040da/fivufagujeferumidudakeno.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f8613aa6---botowebifesuxuje.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mipivizoniza.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/67457953272.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/46540958895.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/44534477698.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/698nsr6lur88i1013m7movmduk/bufuvevezulajukivixawafig.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/4187214195.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/ximokuzilazojabewa.pdfIn PDF document text
    • http://esejsc.com/upload/files/48241939116.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/64154760862.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/27030498769.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722d87d2544---51160156385.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160722dbcd5a9c---vizovovobugewameropas.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/gadugiwipeja.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/69517464812.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58fc154ef---57363785862.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/sukobi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070572ebcd0d---15299927897.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/8990778167.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/kevitojowun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=10+negative+effects+of+population+growthPDF 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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 18048 bytes
SHA-256: 52138db8e7b446a6a3bfaf3be4f332b5c39db140ede9f7e669acc9c05cab4fc9
font_01_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 11088 bytes
SHA-256: b7d7a468eaa4bf8807d01c7f13550505c44973a899ec06caa2a9a98c6ec3ccf3
font_02_sfnt_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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