Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be8a87ee3a9c0cb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 20:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 757b811ef2ccfeb19bb4ea60b30b7e0a SHA-1: 748d405c3fe872b4d9d5539aac24149bee832789 SHA-256: 0be8a87ee3a9c0cb41b7d19a0a7b4197d9545d5ebbc47307ce3a844a9e046af5
164 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the idea that the document is intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=mortal+kombat+armageddon+apk+download+for+android PDF link annotation
    • http://hotelborgodeipoeti.com/userfiles/files/gufosi.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/17249275192.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/810ce14f316d98e6f683bc4310f5da28/tekosutufe.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/12588154760.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/77987713730.pdfIn PDF document text
    • http://mega.kz/media/upload/files/40312507899.pdfIn PDF document text
    • http://centrons.com/uploaded/file/94088338261331b219dc28.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/furiwekezexaruju.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/538f978151f7f577813ded57f767d107/zudenuvi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613230f458f5f---67401507891.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/xebilejof.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/dikevewepoloto.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/79613555573.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/bowimunik.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/gizubuxolekujigoxem.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kipofijus.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/654203189613ff8e1eddba.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/rotuvojozelikurunidipevo.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/xelon.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/48281523232.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/63ae0731ca6d5edaf069b1fa25361af8/376830961.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a58ce46c2539da46ae36d4d46dd5bb38/vovevadiw.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb9d8fe95---72659217339.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/74076620668.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/57503680423.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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 10984 bytes
SHA-256: b13d465bf014c3c83223f30dc561362b20521318f1406b2ef5b4a7f275a17ae2
font_01_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 18336 bytes
SHA-256: 9d4a56c58e147c32bee0dea8eaa72be8b8414ac00306bd9d6eae4eca3e8600a4
font_02_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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