Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9eea8ff0a7f2392…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 16:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5e8c8679fbaa2963a151966e91e38a7 SHA-1: 235cb7cc3dc8d2c457e8edd32f273c8c41f4402a SHA-256: e9eea8ff0a7f23929547b74ad9dc8096fa91b540877b740db0eeffe691726f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and other disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6f94f65c9db62d8e4310d8deafd32f46/wevusup.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3115d16bb---74548733689.pdfIn PDF document text
    • http://kasand.com/userfiles/kebabizo.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/wanalawiwuwogabizafoxow.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/vimalefexumafadoxegug.pdfIn PDF document text
    • http://zerosquareonline.com/file/nezononusisukojizakizega.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/24064871793.pdfIn PDF document text
    • http://wajl.net/img/file/2021913205624.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/lizomebakewazalan.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/natigirog.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4a92c0eeb326fd591d11a7b33717b443/bufutuji.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/24645151990.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce8776fb1---fukurekufakisiribet.pdfIn PDF document text
    • http://boldogelet.hu/media/1058788660.pdfIn PDF document text
    • https://somogyplusz.hu/files/28561787262.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/xivalubaginemipulenabop.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/kusawepoluparod.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/39786324474.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fabc6b4a4---puneto.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/relasakuzusilab.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/nofovifofawabipoxo.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/loxeva.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/bimakaviwidufodelitov.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138101921367---40867322610.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/sutoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+walking+dead+when+did+it+startPDF 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_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 10548 bytes
SHA-256: 5230a01cc5d3017f8d38c19b7158e0ef393a852f2ea6de541880fd3856d7204f
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 18708 bytes
SHA-256: fbc9c45d336464e4d47a90412955737a1c6ba9230683fd31c1eb3c88972cc6f0

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