Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2dd5f074c513f1…

MALICIOUS

PDF

85.9 KB Created: 2021-08-12 13:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2361f019339b03aadca3a1bf35c94a21 SHA-1: 3129cc52206f7920dace056ee418a0519519904f SHA-256: dd2dd5f074c513f1fbedf3585d105b29b75644ddc41d82a170c41ac87f7ba1b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination and potentially distribute malware or conduct phishing. The presence of JavaScript indicates an active component designed to execute code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://slide-bearing.com/d/files/mugakubuzajudebaviwoni.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5907e02d6---33141119777.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaee9e8a6bc.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2763398c6ad9d8071d8deb64340627a3/69929841529.pdf
    • http://gndpta.eu/news_objects/files/zuduzovavatupuvodidufabo.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/51707854694.pdf
    • http://oiseau-bleu-morzine.com/userfiles/file/68921955836.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e288dc63a26---nunapitelajuk.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eff7fb8fd7ab96cbf3062f9b254120db/wotebunezuro.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c863f88760a---babodezasorevowidamovaji.pdf
    • http://orchid-daikanyama.com/userfiles/file/penepogevexufoxekitusuzi.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a3b138f8c---ranubotakuvusejofomedif.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a2b8debf---guwekarurekegoxeralego.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608789b0ba6dc---33425038850.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/bda49a9caffaecd3ba1dc119399151b3/ribezotubavuraju.pdf
    • https://gachbinhduong.com/upload/file/86392334805.pdf
    • https://condicionamentofisico.com/arquivos/file/80099914448.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fd41f7f57a---tavinufefu.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7314a4710---wazivovujapuxobaruk.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d9f95338---xonaniripebex.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/0bs38ao1g9rsi4sodvjsvfamgi/45035027890.pdf
    • https://birotex.rs/images/files/pigujosedewoza.pdf
    • http://didaconcept.com/admin/fckeditor/file/taposajateso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+pictures+auto+rotate+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e506.bin
e152fd6c83ac1e6f53fde22a353b77c46a364b81bdebc209e593aa565f690f20
pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 19908 bytes
font_01_sfnt_off00011885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11885 16792 bytes
font_02_sfnt_off0001309c.bin
1db9a15821fd50ac5e868c0800756751e9358d44db9f1cdeb7240bad769386cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 10900 bytes