Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d9d4f735b2fd82…

MALICIOUS

PDF

99.6 KB Created: 2021-09-02 04:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcf592883dfb9d6603cc8d5aa598e538 SHA-1: e8b0d2ffb4da3ff52addfd3140f7cf7e128c0a5c SHA-256: 97d9d4f735b2fd8287b8b5ba4f6d9122257373511757e550335d75c8e6b69262
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://www.profiemg.cz/upload/ck/files/zazujatovasidefim.pdf In PDF document text
    • https://pasarangroup1.com/contents//files/63865421306.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b03178fa391586e1cebd6f71c06f7906/mugigasid.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/dkau269abqkup7kphlkdeh0fh2/geneme.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/51773343580.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/xizomokozi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/1339917076.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/28274163880.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9b124888c---49413278248.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/53258706298.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c3f6b739---padis.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xupodat.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/rimexusereb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607614a8339ab---35342370919.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/vuvorozemeri.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a0cf4e9bf---fisalulomav.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16115724fe595e---lesetefobuwin.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6fb2ea88baa4c517939c23e8acb44860/jogawuzupofunonipomire.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/97686537213.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/dafelowakoxojavixajiv.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/vefizitopufaf.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16128831c629f7---zerowev.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/wujujamemat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=so+you+really+want+to+learn+latin+book+2+answers+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 11216 bytes
SHA-256: fc33d41dd87bc20dad8ea0a2956faffd99d4f8173152075fb84a0e767099a8f1
font_01_sfnt_off00012e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 21476 bytes
SHA-256: 2ce9517c54815d6bf936888386aa926b5cadf9efe0edb72b299823481bcbfad1
font_02_sfnt_off00016747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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