Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6939fdcb1425fbf…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 06:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 752fb4eb1d74fece4e55fa2d9bb8609a SHA-1: d99b94f2783714683d93410015e0ddc93d415f34 SHA-256: f6939fdcb1425fbf29b87452a1e8868e1727b4cd61440bc3f3f0811b0a383717
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

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 https://ceccargiurgiu.ro/userfiles/file/48310544134.pdf In PDF document text
    • https://onlinendttraining.net/files/66818070445.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/kubaxopotivumonamuf.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/60935769072.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d5db6f45---62897814755.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/11058300378.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97467c1554.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/jaluxejotavuzisepawezu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769229cebbc---jejuwofozexajo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0fa4140bd3f1fc37ce2e215098a6833b/81057407230.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/luxose.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94af8e696---2097697439.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/pemudabaxugasele.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/sozetuvumiw.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/fovuvudobuga.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/73652625320.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/wulufegowujo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf00310b6f---mimifaxafivudoloj.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f014531fb2---xujepiroka.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d616d4d669---75062224298.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60f7d38b8---94197630583.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/77307712446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=trail+signs+scouting+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_off0000c77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77D 17332 bytes
SHA-256: 42796b09a54b1d46144fb3932a06e22db76864ccd32ad87e1cf1b6a25c951607
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 10724 bytes
SHA-256: f442c43e81af0f5b9b3833cabc42dca9ded89709cd04766c9476f6fab2dbcc5e
font_02_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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