Malicious PDF — malware analysis report

Static analysis result for SHA-256 82736c81277fc72a…

MALICIOUS

PDF

95.7 KB Created: 2021-06-28 22:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ce57ee9edf9751bb378b88047da40dd1 SHA-1: e25c380e440f579e0173b9bb810a6479d884bb3b SHA-256: 82736c81277fc72a406f7dadc378586ef342fc186ba768d3019ea456e3db3c71
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates it likely attempts to execute code, potentially to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://susanirvine.com/clients/82887/File/25667350220.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aafe87a91---duxamolomuf.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b6dec581d662b260b7111ecd500e45c7/95148088525.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/26792247798.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ue1ndq8a693hf9bvugadsggd50/kurol.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2245756a1da46763277435958dba5e06/susigosigefejesifo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b50f1694dec---44290822176.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9ac41e23cb914a591048c40a8e325b9c/70022070792.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/78234451091.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/710aacfa4ea9eee9a98c9e658f564a5f/83483034630.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944546bac7f---98586903200.pdfIn PDF document text
    • http://halaljones.com/uploads/files/kixexipuboxo.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa95f87226---rifotarekadelowex.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/nkgr7d66gtrdk2sen0h5srut77/lowasedugex.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608651eb70130---buremobiz.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/goxewo.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607332209d0a4---34372398212.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef8bacfac---78182954411.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/o0nkjk7uac9i48kgq83vne6ag3/bopuvosasisuj.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/87855281672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=union+and+intersection+worksheet+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 10856 bytes
SHA-256: ceb4fe60de83e04d6788d245aff8f0a31aec4a24b9bde32fd98c6b2ffff4b739
font_02_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 18464 bytes
SHA-256: 6748779efe7ea04158a2200df8131939656a3d5624b863589a3ad75ded0e8b15
font_03_sfnt_off00015b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B09 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647

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