Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d28e56096101942…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 20:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 480c2f21501f2f0fde32dbc245a451d5 SHA-1: bf0ce8ba99c21aa0eb03007f54df8c06a50c671b SHA-256: 2d28e5609610194234101051b98093206876b5bf534cedcadc248622289b84c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. Heuristics indicate the presence of external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.alitec.es/js/ckfinder/userfiles/files/76522125535.pdf In PDF document text
    • http://alwaditrading.com/userfiles/files/96457673110.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/17364233382.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/56660256639.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/40258844471.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/54450260022.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f6d61ca1028517b148ade87908425524/57591294519.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/digosujozejimizalepobeti.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24e72eb0c---jotugobu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/847cf91741ad57cec09be402eaf3e9ae/fareburekuzufinoxure.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7d406148d3da680b7d1ef3a468a99e10/visojobelenolejimebexesob.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pifisefabuwu.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/38864437127.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nteu9fh71ijnnvh24f49u8kik0/nesusejesaripe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9936b8b64---66427949534.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5579c6a1729a61f67f6264a142bd9b05/sowuzarabijoru.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/zafofipaz.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/vibewurezimazavumijuzesog.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fa227c1af46544c3f66b9fa7fd3d1a8f/vetapadaborewokazil.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/43857048873.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1adb8ef92---11806641327.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a87c8b08f---73046890833.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/32491577958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=memory+enhancing+techniques+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 11372 bytes
SHA-256: ad89b8e2e8c2e80413342af79569060e7cfbebc584442c853524a2231aad22ca
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 18492 bytes
SHA-256: 4df6cf0a185dd6eb70bb97e8b387073b3cd230043aea8d8ba7a7b786fb7fa506
font_02_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1