Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafd63e1b0628c21…

MALICIOUS

PDF

98.9 KB Created: 2021-07-05 18:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9dcf6128d1414efc5ce9dd5ce25a35e1 SHA-1: 750ed54223957e3195afed0db423ae4a65c11f4f SHA-256: eafd63e1b0628c2124cf0bb59d9b03b0b148f01093f7f6de11f5d5f878b5cb54
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 identified as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The document body is unreadable, but the heuristics indicate a malicious intent to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/618c2001268d2512eb828f8df83ba4f9/10276786840.pdf In PDF document text
    • http://robalton.es/Albums/images/file///vesajupeboluji.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/larowakowipuro.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69e7b4fc2---reniremorit.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/polepubodogaxufojiremaxu.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/9302343368.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/k6ttl72ks3qsmmun36udtbmd9e/numubafaveparetazajovope.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/97011797386.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796870a1ba0---45634670510.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/28972805902.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/nowojulom.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b332db8a613---kizimozadafeg.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bugivolapagujusu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/97042738743.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7c3131bd60525d62406f00773e856daf/45538338372.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ce9gb2nermp20f6s29glo5228a/morujiwamafoxabewopavili.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af90c0efd8f---52937716664.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/bomajotivoredokitevusadiw.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3ec42b91d9bb27da147cbcf4eb9c646b/ranilowebi.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9c06570ca324bbb8f61efce600e3b074/tamimamelibuvab.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160873eee95478---66744627346.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2672918982---juvafoberitujerakebu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070036739211---kuduvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=concept+of+production+and+operations+managementPDF 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_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 16800 bytes
SHA-256: 3b8e1ba1d86629b0dbc97fcbff3bc4213218a45c625cb9ddb7a4ee9013b30b2f
font_02_sfnt_off000164af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AF 11048 bytes
SHA-256: 0deda3545cb0b9c56bcbb6060aa92e795e7194ae0f4c992a3be913170eb1972a

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