Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a889133fd97467a…

MALICIOUS

PDF

95.8 KB Created: 2021-08-11 13:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fede6bc0034a6f8ea92bf252f07aff5 SHA-1: 7b13fab9333541001bb94a59fe716c1c34146cfe SHA-256: 3a889133fd97467a7c0a58e9296f4f68b3e236eaba85f38f643d9a8cb58f0525
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=how+to+write+joining+letter+format+for+teacher+request PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837c2ccac11---2364451893.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/fekonavoweku.pdfIn PDF document text
    • https://educhina.mn/editor/files/wubezetuvomedepofivi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e1bb9874---6169677844.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/ragijogisufo.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vetetoziwenabutelivu.pdfIn PDF document text
    • https://2winit.com/Files/files/nokesu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k7c7q6h8qss8igvtb6m0v81uc2/vilufarusegejerija.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4d496408---48710455854.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/i7o3oiivu111mr9ra5qsmsf4e6/61515473970.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b6015f6a02d3d65126c30b46597059bd/34458421400.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/fokejufemamubuderititebe.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d37ba930f---91527051781.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/xavikipenox.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/627df2930f3daa749770735fa1e8b2ac/32228947189.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/69749344683.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/ropebudozimuluson.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f2d320f1a9a9a82b81cc940d41592f8f/99048129943.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9d3669f6a18b34e664998703b241142a/79482209665.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/18798845518.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/79399510821.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/58403942769.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/lemekabupinof.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/89007001594.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 11236 bytes
SHA-256: 6913dc1757d93d832a6169c531c31d2ba295090d66d604afab0cf55dfcdce822
font_01_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 16696 bytes
SHA-256: abc5376249de283d01a8bec13eded22d3b42dde6dc070bcf2df6f35527312199
font_02_sfnt_off000155e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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