Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb5fa1b5b0a83bd…

MALICIOUS

PDF

95.3 KB Created: 2021-08-05 14:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: afd91864d5572e25ec3bbc90c1b6a724 SHA-1: 088318467c6e7cb6ccae2db2a27a96052912803e SHA-256: 8eb5fa1b5b0a83bdbe416c8ecdc3d4a7fff9f3b1b9f01a34c7261a3d34f41083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious site, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=7+principles+of+applied+behavior+analysis PDF link annotation
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02229b8ec---lulajulot.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7beb0c4b---90698440435.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/24756102782.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f8cc99e47dd9ca26a7db8b056786c952/57106543635.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/rasofenor.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/woker.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a421242707e35ffa76e6f6d174e54e93/13201119128.pdfIn PDF document text
    • http://stattus.com/assets/file/21164866942.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/linuzak.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a50eeea55d8---94422867249.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/kaaa9et2cicru6rk5fgpu5frs3/85994080427.pdfIn PDF document text
    • http://belv.ru/userfiles/file/vedimegomosegatubuji.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/67c59cb0a82da2fd12d78e52a2aba187/tejotetuwibeladelet.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6d29c96f8---zelexixa.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/35465407470.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160847c71aa21f---jukojoduwu.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/90957469404.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/27606155700.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0e9182002---revuzejozokibapizimefew.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22064004248.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/kosapodedo.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/wufekixunar.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///xibatizeduwe.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/fekugulozu.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/sakuritofuvazakixuvi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/aot6dkt83js2shcj3lgeedin7q/91895616885.pdfIn PDF document text
    • https://5uempat.com/contents//files/gulex.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_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 17188 bytes
SHA-256: 95d4993ee01f877bb51e2a8da8fc51ed8347aee3035ae7bb9ffb9f540d49e1f2
font_01_sfnt_off00013cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C9 10892 bytes
SHA-256: ff235eee998bfd01619590d53389a186141e0392a15b5a669800babfd59bf33d

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