Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1a1d71c7dddc39…

MALICIOUS

PDF

92.7 KB Created: 2021-07-18 20:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf5ef7e09d8e6ab5dc39778401301f32 SHA-1: f7f4a8b36c222aa930ae3f45845659b890a66f3d SHA-256: 9d1a1d71c7dddc39547448b61ffddbea08e639e4d5bdc3c19553d647ffe9b154
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for executing the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://dilimkebab.com/userfiles/file/newinubav.pdf In PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/17ecf0a4077883f991ad54f3e3548d21/54560372557.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c176bd132923102bd2efe2ab80c02038/tumerelilozilo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df7e337e424---bunexosenutezimuxaz.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096484c7cc6c---kitowudefudibepira.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160f186a3196c8---31807548562.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vtt3brf1ptfs62slrlc32veom6/31418871613.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cfdec148b8fc5348ad550db9291c5f72/97090695153.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c589fb84---molaxejakujumopo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/aoiqt5basbddske4vn1hn6vfmu/wubuwesafibemumedijuje.pdfIn PDF document text
    • https://ka-base.no/images_content/file/72275736871.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5780d0a5---gigujijuxozofaf.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/77074426661.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1bd6c029089822e45655e02799bc3ecf/52526228802.pdfIn PDF document text
    • http://klpa.net/userData/board/file/3708482603.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96c52acc7---funomafoba.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/86324184901.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79fd29d20a---digin.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/17768434463.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609404101dcff---6695493055.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/jetijubagumagodiwezu.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/70013568772.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/84930481954.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/sixorasepevenufepabud.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/97102647486.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/42617031929.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077adcabe174---57186455105.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/lopugumaxobatozoxudufuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=accuracy+and+precision+chemistry+worksheetPDF 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_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 11108 bytes
SHA-256: 9033621a0e68cb0fa4a57c0b2a0c979f7ef2d98234815b2d36ae0d77c9d5b07d
font_01_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 18192 bytes
SHA-256: c44e035a5f27dbd3484039bdf715eb547448b0093fb098e1152accc30e1b87a5
font_02_sfnt_off00014d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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