Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54c6161ce98aa84…

MALICIOUS

PDF

86.7 KB Created: 2021-07-17 01:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58b588b505a6abfeaae1411547eaf9ca SHA-1: 78fb96e07c29a9e5d36cb099e523d174543a65c6 SHA-256: b54c6161ce98aa849ba0d8d37a8c4d9c283d93ca4dc11aacfab4d35a56c00a74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://lapenya.cat/imgjovesnaves/file/vixito.pdf In PDF document text
    • http://kaupa.cz/userfiles/file/24208764972.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210530_58439D035B7A6449.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c38eb53b---40376790907.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0v3r0nptln9crs8o9nk3tu27jj/sopatad.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e3b09fffcebd17b75fdc973465000ebd/pavoniduzagizatona.pdfIn PDF document text
    • https://iohrp.org/f_files/files/nujetopegidepavex.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f874378390a0d8c8862e4945b35b4632/xifimeke.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ab3449c9a---rijemovarinimi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b240aa0c8d1---56099630187.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3169fb70c15b8f8210bdd6f7dab38c63/76800980570.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b717e28692---kidisivurikazurogunajo.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/tewatoxanevebomafi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b496b3c8ac8---73953852592.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/118124945260d7a98ea3946.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/97900165232.pdfIn PDF document text
    • http://aquatherm-graz.at/files/pazepujufujufubibaba.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/16195855503.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b635f15b9---semebabuxomexetig.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/65338412101.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f02136d0---85339271209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=not+only+in+the+beginning+of+sentencePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede72b86a1a---xikiforidolamunexasikuj.pdfIn PDF document text
    • 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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 10584 bytes
SHA-256: b0f7a1eba2619b724e25db2f2ba71039109fd9a80d644377c20a172ad8684e27
font_01_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 1952 bytes
SHA-256: 956a59ce88d16d18682f88e8006d486c34ec2890eecfa153a08c3a0b5244bc99
font_02_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 17328 bytes
SHA-256: 4008b37662366f54446fb08870a2065ca68878dedebcaa63f2f9090826227fa7
font_03_sfnt_off000134b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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