Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed7e763b91bacb9…

MALICIOUS

PDF

82.9 KB Created: 2021-08-22 02:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b49c1242078fbb9969a69e42460913e2 SHA-1: bffd2d7333329de3402dba8870fd82b9a9f7464c SHA-256: 4ed7e763b91bacb9a2c2769e5a8498d5dfaa433f4ce0d19bd9701e7a60fdb81b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to drive traffic to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=ejemplos+de+acento+diacritico+y+su+significado PDF link annotation
    • https://sanipro.ma/app/webroot/uploaderfiles/piwowowubarenibiwumedi.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/63310066471.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210605164315.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfcd2bc9ad---gamawogubegape.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/42941466364.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/72185621028.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b3d83903---fotebeximufokipogir.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dazivivuwafatisojibobutow.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/7704087016.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/26399699457.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a5e92c1---widusamenuziru.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df52972e1---98813262723.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/81300367156.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3c4ae5eb---18199647006.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe8a34e4e2---sijejumanexuk.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3r31n445nq5tg5gnce9ajbrbjk/xuvigefitisivomorizum.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568d7b8571---puwenuvekomiwumubo.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/mezuwis.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/lewatapanifir.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/98958929239.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8fad2a46758b11e990d8190aaffb281d/zabuwiwo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ade97c9175a55c117156089e8f0a22aa/73274632739.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/09193bc30f626d0e1e6b85226187d147/zoxudazitefixamalop.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/rejowasevefenatofaf.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_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 11288 bytes
SHA-256: d54e65ce0686522f5fe8e0d7f360c4b1e9e80ca272089d6ef9d147e197144f18
font_01_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 19152 bytes
SHA-256: cb974d4562a5a4ee667dd7d876c91432127b102dfc0cfd8a626dd468308150b4
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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