Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb3b292c345269f…

MALICIOUS

PDF

171.3 KB Created: 2021-07-19 03:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 47e2def74e40019673129d272579427d SHA-1: 02100b53168b18df85bf9f1555c2be6183c74bcb SHA-256: 1bb3b292c345269f48cf592d3cde9db79c723a1571d2fe3661c3ff28c0520cdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

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.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87b43d6cc---pepef.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914175ad7c1---suluxiralibipanadaru.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/21459182578.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/sololikafoponugosiwevis.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/vanuveropuwaborukepiju.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/44406312524.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef846134b0---10338810615.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66d906989---77385923725.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad653ca173f3407431aacedb041daeeb/80572533327.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/9acbef9ce61dda2c2445c409d2a80d0c/zugirujelanapakaforowun.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/bipilitoruw.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/12221861944.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/50006741305.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160848aa981283---75589159518.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb56d8d61---8498382265.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3538bc2b---nepojoxibijaw.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70595561892.pdfIn PDF document text
    • https://educhina.mn/editor/files/badururukitajazuralidozog.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980420f035b---41786763192.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/zodesulexowam.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/58591366883.pdfIn PDF document text
    • http://alkanboya.com/files/file///wizitusubelolub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gas+dynamics+and+jet+propulsionPDF 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_off000223ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C00 19544 bytes
SHA-256: d37ac2c86734e40d70267066c2a1f9ee15ed61421b77e2452a96af1231ced952
font_02_sfnt_off0002701c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2701C 16132 bytes
SHA-256: 85a29239ea27034ac4c7ae7f0dfdedfed7fa09fa0cd541567a4ad9a65faa80f0
font_03_sfnt_off0002858f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2858F 11056 bytes
SHA-256: 05014717f184ac6aeb5b0659e2160901396c95450fc790b3d0685ce6a81e27d4

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