Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d15af1cc961de1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 15:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc6b34bd51722582a3aaace0fa54d8b5 SHA-1: 5b5cf11c809204ed243c94790f73d6c091b4d22a SHA-256: 55d15af1cc961de1584a462f4d122fd643ff5ea530de2e8186fbfa824a682b18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This 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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://infrive.ru/uplcv?utm_term=libro+psicologia+educativa+david+ausubel+pdf PDF link annotation
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161321c09e352d---wuxarexowobap.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/64338715321.pdfIn PDF document text
    • http://ipceurope.com/assets/file/87621392517.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909054731.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/59779075631.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/diwuvi.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161375ff9960b6---18989621769.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/fumubikapegelutop.pdfIn PDF document text
    • https://redac.ch/upload/71851117808.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8c6b26d985c681949a440f5e95a84bdf/fanoturimizokitiwu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450d207f6ce---84932268527.pdfIn PDF document text
    • http://pololanna.com/user_img/files/11069982839.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/folumuditivenasu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1c439de48b772d86032c69e9686376ab/bibizuxizamadaxu.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/zodixu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a431300ba---9810506871.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/jonatukupoz.pdfIn PDF document text
    • http://videlec.be/ressource/file/66140186404.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/83606541944.pdfIn PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/22359520664.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/vadugogizi.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/jovotinuwenixuvi.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/merevodawadokozuxu.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/wejesakosopun.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/zamigen.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/2993170608.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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 18204 bytes
SHA-256: 3c978eeebb231c5ff0de73b9fbc7b305b9917b7e02c3e417b39de4fb94846bfa
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 10952 bytes
SHA-256: c00e2e8b801e3eac8e8145bca93db24b12bca4ab425e13b0e32c5698ffbb6e5d

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