Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b1fdaf377b0a3b…

MALICIOUS

PDF

91.1 KB Created: 2021-07-24 07:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7377e2a4bf295ea16f88d6fe995c9edf SHA-1: 4f0d022fc23c86440b05f39bf1c25462ef788f66 SHA-256: 98b1fdaf377b0a3b04790963cf88fafc1c87b25fa7f418cecf8b1060e1c40e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it is designed to host and distribute malicious files. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/amuokedvoj9a81es4s3oriuidc/90023885329.pdf In PDF document text
    • http://rc-modeller.se/images/file///22055761827.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96a70f255b64201d3cd28e97843dd2da/xusosikizazelipula.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/uimcrf4540fi3tfn6knlamg8t0/gedesegik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c3500e308---44644878182.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/1053836310.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4kfh6irbqp9b2ac4g8kt33ncpi/94730685030.pdfIn PDF document text
    • https://actor-conseil.com/files/file/mobubudodaf.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/lajibejobululimoporo.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/zezupolojid.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071fce46e5d8---664966106.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/tumetidavakekejuwa.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/7664e97ce239447b634fee51801b998b/57158669185.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/84612767197.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/paxopufal.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/m1g889v3t7lqt4rjvmrr9m6d4i/pomowakilapukotukunogexa.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7b5b8fc59a0f4e3d702eb44dfd97b6ae/19853575105.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c8da83a27---75261026304.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8da5246ca---pewewubiwirewulexe.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/pitikuzuvekexodegixa.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/waperamusoseretujafokona.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/gegig.pdfIn PDF document text
    • http://proxima-design.cz/files/file/buxukuvovunedisevikuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=modelo+de+curriculum+vitae+pdf+para+descargarPDF 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_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 18512 bytes
SHA-256: 473dd1d17ce0378d86719e29baccd0a03bc7b03bd2f998f5ebf9f7f599d70eee
font_01_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E5 11016 bytes
SHA-256: 20b08d1b2aa082d0a5f0b3e00be63e619890205d0207601fcc299614b4fd8732

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