Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e85ff57bf1b3bdc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 00:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1b69bb0d144156ac08b4e4390186319 SHA-1: 68738720a268710eb4de4c48c8c2fd84c8fb8150 SHA-256: 5e85ff57bf1b3bdc7d54564f8228c2f980859b387ba4ad8337456abcfd591fdf
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oteaexpert.fr/cite_imgs/file/madolewatove.pdf In PDF document text
    • https://wickedcheesy.com/images/file/76064444699.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/98316130785.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99776311983.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/resedazutesivukowadosu.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/89206642582.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4465bc36---24541312714.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e666d5ebdeb---dojulesifajulipuropolo.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/rinolagaraludixosabolate.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/laduzunawamazomazoze.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1mfalsho7cfot12gflb5s13s53/likinixuma.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16100d9a704348---62014670961.pdfIn PDF document text
    • https://somogyplusz.hu/files/liniwemapexatumibazof.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/vepufejigogeda.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/ripulivetebivume.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ff395768---wusotujezamipagilafefu.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/tobewo.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-19/20210819063207110697.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16105a9d667393---64268765401.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b350dc2aaf---19735764130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=grade+6+percent+word+problems+pdfPDF link annotation
    • 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_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 18348 bytes
SHA-256: 8b7dd3dc5dd03fd2e8f8dadbf7b545d7c9ce9f5b206ab20f6a78c3d983e17f8f
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 11120 bytes
SHA-256: fc52beeac7357074acd405a6417a841e5bd109fe65c51231d4fe8c4496fe53e3

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