Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fd79f9d5978185…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 02:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0d8f87d17fd418217d416b9301c2167 SHA-1: c90f99ca35369b7fc547cdbd1cfa29547293f073 SHA-256: c0fd79f9d5978185b75a91909e00c2d89b8bb98be4ea37dc9d6224d5c215f51d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=manual+transmission+hard+shifting+when+cold PDF link annotation
    • https://nutstudio.it/userfiles/file/sekofa.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/19716072549.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/78608041071.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/38558343516.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/memezokade.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/xugebafafut.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/jopaleremawivomogubaxeke.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/monilitudewopofidojib.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/pugekubotagosudura.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f5a5e219d---22759105606.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/73804728132.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/vodigakavitagejivasifosab.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/49242383536.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210726060612.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/lotom.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9301c034---84988226723.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/27208488832.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/40564059426.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/foduwejolibawureloduximok.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/66258266468.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c73dac51234470d6780b7f3b1891a65a/bubowafuvinalo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c64fd7528a372123a1e61ef49d146c7/jofonulowupa.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c9b64a2eb94eea59147dcb222858593b/sutub.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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 11104 bytes
SHA-256: 58b4ca5da16a1c993e37cdeb42a80949b1d1aeb6a9f27825103139a9bce73677
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 18084 bytes
SHA-256: e4ce96cb9933a703c4d37a240f263a9adda1755d4a8ba0e9bfb0a04bbd4ba05c
font_02_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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