Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd76bebc21769d6…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 21:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14cf445eaffbfca5623e3d4d6500c689 SHA-1: 56389acfac088e81676f9c824d408510a7ac3d0a SHA-256: fdd76bebc21769d6516bf0a745c334ae93c8b1709fbd1cb7e99c80642c9f8144
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://joyandwowbook.com/upload/file/20937039312.pdf In PDF document text
    • http://sugarfree-gelato.com/upload/file/muxozabuzat.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6e4c8592---mirugojujonuzigaxoriwima.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/31521138650.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109010331296849.pdfIn PDF document text
    • http://finchamauto.com/pics/54325761128.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/sipumafi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6393dfac---lopuwidalatubesolakoja.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/86588508561.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/nofaxisomev.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/88194344125.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/davapelumud.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/93648844039.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f93cb290a---maxifiwelolad.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/40047584095.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/182820205061371d5e068f6.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/87686896028.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/gemejixuvuno.pdfIn PDF document text
    • https://svltv.in/userfiles/files/sozix.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/mutafudoxepepuluforol.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/14502914697.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613213673a6f4---20993812073.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3b5dd39811d1e24f7884e589207f4b86/94662035407.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dae04de13---11243089197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=year+2+coordinating+conjunctions+worksheetPDF 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_off0000bd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD69 11116 bytes
SHA-256: 8dec9fdaa8d2f99e874d82a5dfe7178a146c75ba4b4235a988cb1f280a67b0db
font_01_sfnt_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 15916 bytes
SHA-256: 5c2aeee318cf4a8d74bab31931a86e219fc690c0cc19310c08723c30fb55613e
font_02_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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