Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32e6af34866a42e…

MALICIOUS

PDF

87.7 KB Created: 2021-08-10 20:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b39c503ffe1f7315309b9e2063f0677 SHA-1: 720d7650576e4bc49ab82ea700163fd919c68b89 SHA-256: d32e6af34866a42eb9edec75219251ad6c34bb1346e96da2e1971b9bdad82358
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution scheme. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=libro+de+bruce+lee+pdf
    • http://talleresjpg.es/img/file/renupive.pdf
    • http://come2menorca.com/images/file/84627329761.pdf
    • https://affordans.com/ckfinder/userfiles/files/37511997179.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc188873e---12582812944.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106012320038502268kzli6.pdf
    • https://hagabb.ro/ckfinder/userfiles/files/94167785957.pdf
    • http://eska-lift.ru/userfiles/file/kimekir.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/8497740415.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/68771502586.pdf
    • http://gpe-el.pro/ckfinder/userfiles/files/68102533851.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9075ef2bfc23994649d89e474ed698b7/8193411337.pdf
    • http://brette-animation.com/userfiles/file/20422333267.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3hthtc9afpeq8cri7p5npqkt1c/64200489399.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kelofafejewes.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/98516511570.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5be39b2542---43000959266.pdf
    • http://motoren-adachi.com/js/upload/files/vejekelifiga.pdf
    • http://secohthailand.com/file_media/file_image/file/55966268995.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5b71857d525d327d9a2dd642ec0bdf91/34707369856.pdf
    • http://sparkpro.lv/content/file/divoroxikovafal.pdf
    • https://doganagolosa.it/file/35909630970.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4eede7cb1---bixerezavomesore.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a410b41b5---13853837066.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cec06e931c8442924ff9f075b9bf1e6e/venadoliberak.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baaebacbe0e---polarubigabavologof.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160924fca59210---76058448812.pdf
    • 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_off0000ee7c.bin
d46f944b00a1d0295f914e040c7a1836800c1da77d5c1f3b8d24bde2fff29ed4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 19152 bytes
font_01_sfnt_off00011fd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 16792 bytes
font_02_sfnt_off000137ef.bin
a95069fb177899d8f7fbd780f49d98cfdd3e213ca9b27cbb568290f3da2cd627
pdf-font-stream PDF embedded font (sfnt) at offset 0x137EF 10280 bytes