Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d5ab10fb721679…

MALICIOUS

PDF

110.0 KB Created: 2021-08-21 05:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cb111d4c6b3cc3237a148c15b4bab14 SHA-1: 9ddc8ed1cbfaf8e12765d773fbde56d2672dbfe6 SHA-256: 97d5ab10fb7216798c03ee105b3371324f277b1e484f74926907bcd3134308ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a350410d---43457162550.pdf In PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/66828885573.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/rewewibu.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/fadalegimaliwoligokowalu.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/58072826877.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c6cdf69f4636397ba84bb6873436da55/48625073550.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • http://www.polni.si/Images/files/17899246097.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/jexedopodivil.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/90hhabsl4kjmvlcetn1ttr5p0v/56180810718.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/vakufitafegojoxapog.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/7ns2rvq3gko3demdm6a6r08s97/goxalab.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/xexarovodewa.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21b523a94---58418621316.pdfIn PDF document text
    • https://fratellifurloni.it/file/donunigebobutewodax.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855cbd29902---88317521610.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/36509466704.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/xololemobuzewilapesajuf.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0f7d558bb1f34773fd88a105af6d0843/37339242131.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/rodinu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/92591837971.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899240e0d49---xebekekanukulap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=auditor%C3%ADa+administrativa+3+ed+evaluaci%C3%B3n+y+diagn%C3%B3stico+empresarial+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off000141d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E2 18664 bytes
SHA-256: 917227572692ded95b0656395d33aabe47dc2cb4589549e017b9c2be62e723dc
font_03_sfnt_off0001897c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1897C 11596 bytes
SHA-256: b4b98a1a7e39d8785321302c45726bd19bb9f44e00f15440af79f221acd91985