Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3baada9f7869e12…

MALICIOUS

PDF

110.3 KB Created: 2021-07-20 06:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec6e8e73e929a02b841bbfa708c7ba62 SHA-1: 835736c653042a34e7b6765a91812c16d058bfe6 SHA-256: e3baada9f7869e12f08d4145e803e35e69d9aa56371806987b6162e0ee3332e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several heuristics indicate that the PDF contains links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous URLs and the heuristic findings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/t4jbf279hd5k5v4jn0v84uvvr2/53770297371.pdf In PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/29613239005.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/60482174618.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62dc4bd470---wuvivexozobudububixo.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/24200078472.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4fa82b83---67579785170.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd050decc---78634349163.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b64efb4cb78---metoliwomemojebefofufis.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/86303373363.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gil1p3rjq4p7dfi79jg564ohj4/38595729022.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/35296724441.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160750d774bb1a---7241596507.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/a8f6c8a7pd23a6o9i525e5cfc6/najavuluna.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/2586ir3qd4lav1pb5sdlvfkask/dixot.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021052116216123538.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/126d04e35f9d787b0877c63fe4e04366/munizadefonogex.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dowuwinorupajigazalaf.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b0fc0c70bc6d753b9ae43be0dcfce23f/44923547528.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/wivunos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=repent+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001811b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1811B 23156 bytes
SHA-256: bad9d14772375646512917f2526330a93fd528c174f68b0f8cf269fa633ba50d
font_00_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 4000 bytes
SHA-256: 85732e8cf7464ec1fdeea00605d643e12f25c175db3813cea0624190e1bdca71
font_01_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 10196 bytes
SHA-256: 206c9b7828b8b4b0eab85bd20b0e1288f2e9f541e2b6758fb49b40d128186fb7
font_02_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE0 30148 bytes
SHA-256: e3f39af28f65e3da078d92df8c329c5a53d0629b9ef44beb23b7f8054ec1f258

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