Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb3d37f2e989bb5…

MALICIOUS

PDF

95.4 KB Created: 2021-09-02 06:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7179e7b25b4418a60068d54214e93c9b SHA-1: 94c6ad3a5e5f0cfe2f29c6d17162cc3a89430156 SHA-256: 3fb3d37f2e989bb5ee76595d89948f48d098f8c163115f5d0ef0bd5c65647b47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute phishing content or download further malware. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://inwebjor.ru/uplcv?utm_term=learning+notes+on+the+staff PDF link annotation
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/5706d4cdff420796bcc1442e4daba3fc/12601061434.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/misavipejogipalawezadelo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dbb436fc88facffea9431da73bf4f4f0/zidirimufanejomod.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/62144906235.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6a0318ab---55377228107.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-8-29/20210829045400411720.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4b144a7c88e7b74ad3fbe135646190f9/rotowinupetabef.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/24400055759.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/nudelividerugofopafirus.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/penajogi.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/99833436389.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/vibezajaguxale.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/fa220d667a87e2284f4ad8c72b9c89c4/pazajidamimalelaseb.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2225427ef1---duxabudidesixuwu.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/sulibezivimeraruzadoxuv.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0fde2db52632006e82f91c913e7563be/guguvixis.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914b72df335---pajogekovura.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094566e51b3d---34625097819.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16111353ece9b1---jufikupimozabogep.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/kutugamulikitivilikukej.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6b616467b036d4bde071cbea8b5d653f/xazirezakasizuje.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/kubekup.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/wazop.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ab1b976d5---gevabovomefufotewefi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/oiphc4obsmu03he9nt1vp2r6a3/3892358378.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3244e51c---xusapigapibaromafuxunot.pdfIn PDF document text
    • 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_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 18260 bytes
SHA-256: eebe661bd5030a6613efa211130038203b7deaea92a02231302fd35b71db07e8
font_01_sfnt_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EC 10404 bytes
SHA-256: 31ed0d50f684fb02b0c442655968b05a8c8487a8f7710678f765f428efe80507

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