Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f7311a0bf631f4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 07:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0acb36fc47af43f35fdcdc7fcf109c48 SHA-1: 679d5f662f13f46de66f43a8a3247b6c2ca75a92 SHA-256: 34f7311a0bf631f4d62eee04c239b78391c970be6ce3721567cbe353a50d1e11
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. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection or further malicious activity, while the link farm aims to obscure the final destination and evade detection. The presence of these elements strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=mixed+conditionals+exercises+pdf+with+answers PDF link annotation
    • https://florerialafloresta.com/ckfinder/userfiles/files/64783704310.pdfIn PDF document text
    • https://vestol.bg/files/file/nofoxezelevu.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/zuzad.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/64346936813.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/06cc4e0a901f5fd035e7fc3d961f2cb2/18218224711.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/jowunabelafefumud.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/53990024544.pdfIn PDF document text
    • http://runhouchem.com/upload/files/sifebubivufi.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/wunusoxoputidefiviro.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/jekasiberirum.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/41197227475.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zuramalutok.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/85939441606.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a975a1bb---11042336926.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/18488201827.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/21494676451.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/23382099924.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/63051254507.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/98763970658.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/255f096c9e3e555b8866425d0bd85bb5/36292823882.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e59924f6---wunazodaf.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/96337045272.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-08-13-23-39-82.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/49163196850.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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 19172 bytes
SHA-256: e621e627e28f4f955be72d3f5d3a0f2a1ee1a7ca96b4c75bec8ddee7ea421109
font_01_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 10896 bytes
SHA-256: fe485fcb57d26bd60c9c6f72147a66be24330ac37c0d73935521234bb95f5a9f

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