Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1aada4dc2ee90f9…

MALICIOUS

PDF

91.2 KB Created: 2021-08-12 00:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1728da4cc52a64d02c89c1f73808eed0 SHA-1: 555f6bd1f51190995d9501c825c1fdac00b17606 SHA-256: b1aada4dc2ee90f9ac2e959e959843843463574140f90fdd5278395d6bab40ef
164 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to phishing or malware download pages. The PDF's document body is heavily obfuscated and unreadable, but the presence of embedded JavaScript and numerous external URIs strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cabab857bc1fc9c5c8147c61362a1f7/51260878763.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a9f735c2a122cd163e65421205bb40dd/fixupizodalifitawilu.pdfIn PDF document text
    • http://bawwabatrizq.com/userfiles/file/nezulumamipob.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e40c5532c0c68e1573c7e0e0e43a28b8/88070814218.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a2d26f36e0a254b715cb396e744d620f/50309632437.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce69ced634e---notusuzozejinonibelitu.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/96448942737.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/99752244396.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2f5600b5f881afdba939feb425ffb646/61879982638.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/98604468686.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ab8ed7f79e1c9ad291dc3d043591dc77/25752085104.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b3c5ba1be---93891606658.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cel37v56tdh426spr0b3evt375/setimedu.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/91715451047.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f435924d3d---15899523101.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/6a99ec09516c9133146a849f5dc67757/perove.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160832f4f88324---91004071473.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/sd5gb8nlqif8migu9g5q2cpeoc/7886553839.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/vuripanezoruxazep.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/9871166501.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/mukelenisawetefosuxoku.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3baffc3c6b8601a6324c1c55ef386acb/jaregujatisuzovurojup.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/bemalinixoradim.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/99822186578.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/83425163669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+open+bose+soundtouch+300+remotePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 16064 bytes
SHA-256: d93f7c7c39336916aae847608cd0c0c304c5c28e73ef836bb1322e70c5ed836c
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 17644 bytes
SHA-256: f2b0856de1985aedd7c2fb7d1632a5039b3564117c2572b43575db765c9f3e1f
font_03_sfnt_off00014530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 11088 bytes
SHA-256: c2deaf923a77eb7dae1f718b65c1ab6bdaebc83ce0c6b1374c25464ea8d478a5

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