Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd1d47b40fc7653…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 12:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 740d39a64cc16417ebf082ca6e6f7a22 SHA-1: cdad2dd343e964af88e1659fbc248616ccc443b4 SHA-256: 5cd1d47b40fc76531d2bbc02e86fc13a8bfa29100d792897aeaa5f4376cdf85b
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm on disposable hosting and compromised sites suggests an attempt to obscure the final malicious destination.

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://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/bosalasexevazugeb.pdf In PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/tibanegi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/o8hpeo56t62m486ccegskb9gjn/74260991903.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b16e9cce30f---58382668424.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/32388087819.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/1801785209.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/rizuju.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/34546115790.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7867e421---33407105106.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/148a907f75413a5b26793f33b4a82ac6/20873485886.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/25871477592.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/89010025376.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/piwekalowudoguvosudu.pdfIn PDF document text
    • http://scantech3d.com/files/zijemexolifof.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/1918215816.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/joporomilomes.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f967c078604cae784a1ccce2d4e15f5f/17877351450.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5bb26881---pafetifelivemaf.pdfIn PDF document text
    • http://faradbox.pl/files/file/52358372832.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a9f2132ac5772febb50951432ab192d7/daduleduvaromiduxozebi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mt2ks8i82gel03sjie6f7ovsb2/30376996489.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/warivuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=echo+show+5+user+manualPDF 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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 10608 bytes
SHA-256: f90da28b5938faa6ccc20467db0213674e288c79484addbb7e34353f551e44bf
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 17888 bytes
SHA-256: 420b946df031286e8204f786da021580f9968a22938e6444bfe48bb886ba69eb

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