Malicious PDF — malware analysis report

Static analysis result for SHA-256 c697156273b8138a…

MALICIOUS

PDF

95.8 KB Created: 2021-09-03 09:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af4b82078f3a9ae4cb3bfb9543cbdef1 SHA-1: 95148ac93211537864df3272b8d94f87d6e22b8f SHA-256: c697156273b8138a00854eaee5c4ec9ead5c0f04434c5baafeddbfdfb4d85b5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by presenting them with deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://gazeta-msp.pl/user_files/File/wabexajorasapugoki.pdf In PDF document text
    • http://music-summer-courses.eu/upload/files/foxeradopoxixo.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/34092562924.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f1228ef49---7362418232.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/7171499556121dc4aaa8d2.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16096d742e680a---69394750451.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/u6e75rlmmrs3rg6vag21olcjsd/vamipadenorurejitasamoxit.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/6654446685.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/305g0pu3sb33sjqfnqj05ta7o9/33393910320.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2b2f986a42f5655c3f1f973d9848f39b/fotepawozuga.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mam8fvu1qoeqf45ao13rpkr1bv/tulop.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d473e7d5cf---kikanozalizowarita.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/xerigujewil.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/jazulumugopej.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607593cbe294a---17163411301.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/90331787902.pdfIn PDF document text
    • http://haai.org/upload/file/xebigolebevetazat.pdfIn PDF document text
    • http://accronline.com/userfiles/file/46405779680.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/zezuvidu.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/vusurobutikoxezevedopu.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/824fa4691000c30e9398ce6b6762255c/kinegeduwozofukoje.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fabfbae30---95762764185.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rhlensrb6net4pdclnbjg4g7sf/52840150763.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/88062559698.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/pepazanip.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa74570b97---raruwoxulubamonagonutazen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=taller+de+titeres+para+ni%C3%B1os+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_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 10660 bytes
SHA-256: d4e700436e3f68f842c9dc8c07142689a11ee4f38df471ad2694f8d5ad08c569
font_01_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 20800 bytes
SHA-256: d1726242b57660f4d05c4a8a0fdb39cb8eb0f2ebd616ae30f7100f7143edce2f
font_02_sfnt_off00015701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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