Malicious PDF — malware analysis report

Static analysis result for SHA-256 570fe011e5feddbc…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 10:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65449d7a1c60636f06eefe35a9886090 SHA-1: 5cb7083b8961a7fe2d0e612d368a623d14abb2fa SHA-256: 570fe011e5feddbcebc37ac7821887ff7bd9e3b40fc2bc67b9060a616c32263a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=sentences+starting+with+i+am PDF link annotation
    • https://tennis94.fr/img/pics/files/67421593398.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/80321857502.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/fojatorarino.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/madixi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613410e50c250---7535873493.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a51e54f28---kigotozudofutejam.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/zaware.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/8802835647.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/73217744431.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/guzop.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/pikixigisawid.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/kajodam.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/14486562835.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d257e27efd---rulatururezepekopig.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4hvhdhncbac7femocf3a1rgedj/mesuditixifum.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab3913e67---bibopa.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2b6edebcad4ed38631477d64cc285faa/wodosopopuborap.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sopiruzunonerotimam.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vanebawefulerusakadupekov.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/lovop.pdfIn PDF document text
    • https://empresa-venta.hr/files/87461509380.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/33520220775.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/27903711519.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_off0000c2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 10672 bytes
SHA-256: aa2fd35f7647150ef93e21e95ab3423a07b43a3813c23aa3f564765f6b5be9f1
font_02_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 18060 bytes
SHA-256: 9513476a9484d1b82b1bb22b535023316a841bb6bca916f7d00d4e2653c0204a

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