Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd9d87554f50c58…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 04:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3d958163e1b038083a9995de41ee7a64 SHA-1: 1e52717d7f6a219663299e64864035cf36839df3 SHA-256: 0cd9d87554f50c583360eca0b87b9ef860ee6f82b182ddfa576af82ac4bd08b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.ximangsongthao.com.vn/app/webroot/uploads/files/wotusobixesisebesazi.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a20b81f446---28649749843.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbdc72df3d---61391555931.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/71430500547.pdfIn PDF document text
    • https://hsse.cl/files/sapajux.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137534a24103---43125270323.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/71654549049.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608400b1ec97b---dokakapikinarofotibebivu.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/2741381470.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/daxike.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/98152320705.pdfIn PDF document text
    • http://daydala.com/userfiles/file/tatatoxobomoduxekiwiv.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/livuzev.pdfIn PDF document text
    • https://avvocatoboretti.com/file/zivapatut.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/xizemevuw.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e52357c2a---mebexuzegodewijetilaxof.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/93531601478.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/dinebiwimowapirojuvixit.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cb074d32b20f49a7d0dcc69e2226ce42/kigorafeluzarizekivifefag.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/betesanudujomunesunamu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b42c2d6b42c59c6185109b2999a38cc2/temati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=postscript+on+the+societies+of+control+pdfPDF 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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10556 bytes
SHA-256: 2b0706b7261547bb1d027a9147c72c46384d6b2cf46ff4702fb0e4d9dd8ca966
font_02_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 18080 bytes
SHA-256: 3cdbff03f61a7429e83bb1460f5676733e05232759f6f594bd6633f79cab438f

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