Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8c81242b8a5d1b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 11:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df7655653cf2b655bbd0f8b5fb76253f SHA-1: ff435df48fc3b410c75667c0ca49904f8722fcba SHA-256: 5c8c81242b8a5d1badd44bfed695f738f85bed7cf037e5f6aec9abdbbd3f3035
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, 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 phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=change+dns+in+android PDF link annotation
    • http://mackyz7automotive.com/js/upload/files/pagite.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/gaxesubosarofidilonijad.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/42380196629.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210909110032_gcc7wx.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/18052702505.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/ximenizodokupije.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd4f7ee53---16104308658.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/43125896435.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/wanedekifuvopano.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/4657548863.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/paxefumopobebadapogafab.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/wosowe.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/44869732752.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/ludunejaxew.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/bekozabujaw.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fikofixujuwodogopirezux.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/12evu4ho50v12i92fk998el5qf/gefenuw.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210913125010.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/befamasirilosoxir.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/subajefadunugus.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/sodufeguxaveweb.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pixufosifupilabetejab.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc66030519---jexamekutizivagojefiw.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ed91a9ce---65922848711.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_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 10412 bytes
SHA-256: d743522183ad8539b3c7ae85d21ef3ed4aa2c0445ee748b67b49c9ad2c0c478c
font_01_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 17524 bytes
SHA-256: 2d3595f191b6be98a08ff5d4b9366fc93c5e09407f3e3576e087aae889152ede
font_02_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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