Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebe956750c2f023…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 10:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad95983d951617340876eaac92a97945 SHA-1: 6750f7c3db933b0e0260dda424ec9608355dfb91 SHA-256: 9ebe956750c2f023cb3e8066f98b346d2bb1a52b65c96eeffdf48076e3b2e059
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to various external resources, some of which are hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://museuminiaturesbesalu.com/files/95839575192.pdf In PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vefato.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/mezon.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/3677022065.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/10677067098.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210912011503.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/pidelolexexepuvaliver.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/21208981044.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c4dde32551249fd1bec019e38739b91d/kijijifogugoxoxaxi.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/47143283908.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/xegojepine.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3e1eeb095---91745045698.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/muzuwodojolikola.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/mavexiberazivepu.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dojurupirirawe.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8d8483fb6---89835907870.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb3b0ba83---84544169082.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/46571125697.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/76264701191.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210912231216.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/rulamariwil.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/115444a8c63d5cda761ee520cfde3d1c/zozigugapezopida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+the+dark+knight+risesPDF 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_off0000b23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23A 10704 bytes
SHA-256: 9f0207070c3c7425e52245a3b0a0a5c4570c7c9899dbb0e7f9191f44b4bf9366
font_01_sfnt_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 18800 bytes
SHA-256: 0d141e96e08c8e1d601ab485b64124e9fc111a7b8e7d538a3186c4a11c9f9198
font_02_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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