Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0206de6e900a398…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 13:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a331526aafb2a19abbe0ebc06107286 SHA-1: 3893a611ad538b358a247651c39a165ee8f23e1a SHA-256: a0206de6e900a398b286b5ac71b70c86e5aea2ec1822d3aaeea09c7bae50bf24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=android+unit+conversion+app PDF link annotation
    • http://pune-india.info/userfiles/file/repuromil.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/53792713321.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/70247988928.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3ef8eb3b4cb896ff6e08c0a9844e5a03/50964459380.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109241633543295.pdfIn PDF document text
    • http://centronegozi.com/public/11532805385.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/24598420506.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/56238907462.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210928_14E96FCF675E92C7.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1632793595.pdfIn PDF document text
    • https://shibbirs.com/media/files/58778400989.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/dozemalilusupinijo.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/45709425294.pdfIn PDF document text
    • https://miminku3.com/contents/files/63286435705.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b827a6e6be---79576695403.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/tozovixezewizafawofuvov.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/17094178725.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/volux.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/62917541835.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/31924411880.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/pazunejalulipujumirilol.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/gebemurixaxilisa.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/fekamopewiromikarexe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc8c9e53c---wiwened.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_off0000b215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2C 10608 bytes
SHA-256: 2018ac1d9d13ce76930e8903ed1fd2875fad9a7ce3652b81443ade832a99ffaa
font_02_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 14752 bytes
SHA-256: 84734d32954e7a6210d3504afe345993a1d4d7efbf97bc456b7722881bbe9312

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