Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ea00361f65233b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 01:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39262ec8a340cc4d503b2d9244b59bd6 SHA-1: 354717bf8c56b70a92cbeb1b8ad2a101d5efb6cc SHA-256: c8ea00361f65233b9b963b89e4e484e23444f42025f79683724be40d172d8244
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://queure.ru/uplcv?utm_term=calendar+spam+android PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210902_080521.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/97515242216.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab0c2d001---6988951236.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/60981434857.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/misikeronuwu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pc3u9ud4hov0n2fsoujqne3tk9/23810777926.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/xusojekuzegexa.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109130643226781.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/bivevinuzabininegeweru.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/bezewosuje.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/ponabusebagap.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/90332958970.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/74883185082.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/nutitufusovare.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zonedajurisozisixevuz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dir80scpo561ls4gci7vvqfmm7/10833666343.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/duxikara.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/17396914137.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/nanosedilifepepapu.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/soketar.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/jonoluxoneta.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/86158796623.pdfIn PDF document text
    • http://dailyiat.com/html_upload/file/54332088549.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_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 18364 bytes
SHA-256: 65e49c56551adc2616329574ccf5bdc45482c9f03460e25eb4e0b4c541c8c7c2
font_02_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 10488 bytes
SHA-256: 9b630b70c67788588db9442fa14ae07401ddc2cc18f2b711246122b8a076bc54

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