Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7075236eea3209…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 15:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: beadad8d415d2cc788f15c5b5382f546 SHA-1: 440e6856781629ac1242e30faaca89a5f3838f84 SHA-256: ed7075236eea32092c9991af89ed48b0f14385c32694add43b7d66bf5e812ed0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is often used to execute malicious code or redirect users to malicious websites. Additionally, the document exhibits characteristics of a link farm, with numerous URLs pointing to PDF files hosted on various domains, some of which are identified as compromised CMS uploads. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec7063cb15---sipusimofu.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/eb99d797e9172ebfd23e875d8118f981/64353527830.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/99500657781.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/fitibifevidomulan.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/66661500934.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/9324924566.pdfIn PDF document text
    • https://ivanamihic.com/files/54950557018.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613213f038d3c---juvufaledirodiseruwifo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/00e14456286638700d6051b3e3b40ea4/76181251793.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zewawa.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/rejufatevumugonemufo.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/63940052590.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/puvewavo.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ripoxazumit.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/11421415218.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/67563753141.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/79813538981.pdfIn PDF document text
    • http://atek-ent.com/upload/file/getutoxezadovomijixikipiv.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/70233884223.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/pobuxos.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/91575315226.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/93012843751.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/gususakenulopotenejijir.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/joluvalunerotumeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=good+evening+funny+gifPDF 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_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 10272 bytes
SHA-256: aba0a1dcbabe5cf517f2225c9472a69c761eb91c004e634e354fb84df884e951
font_02_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 17312 bytes
SHA-256: e90c5a7394ae321d85c606a7e7d92c44d6bfda415a50615fa7fa44e615f809e1

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