Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85bfb604fc2985c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 16:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 859bc54719eec2eebb3a81835c1aed56 SHA-1: 233a30797660ba1ab45876faaae3a1b105d85637 SHA-256: f85bfb604fc2985c9aa723ffe106af5f2bb1ecb835f0ef54b828bf9a0de56c96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161400c817502c---74232195648.pdf In PDF document text
    • http://traktor-tv.de/sites/default/files/file/doluxalilub.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143d6b192c2f---luborewug.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/pagofop.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/xusar.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/kejukijopeje.pdfIn PDF document text
    • http://rhondachem.com/d/files/62902912426.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/dudofuzowiwo.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/11744410814.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613164a68abe6---nebejixokitefoze.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/wosapukibutanono.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/1100469977.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/31458622646.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/87423392346.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/38111370835.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/jiguxawaj.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/74573111356.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a792eb14322ecd38713312e9b7caff3b/nazodaku.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbd2dd39a54e7b91f6ac3cda25ea0435/40332026299.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/15761391353.pdfIn PDF document text
    • https://unaizahic.com/Files/files/gitami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+network+and+internetPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 10468 bytes
SHA-256: d3349b15b7f0cdfa1b03af720e4a8736cfe4f84e484c1ecff30a2fcfc2fe64d2
font_02_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 16928 bytes
SHA-256: 19b80a962aa3b760071fa5da65d5a2730e85f5e431a8cc31da9dd7cbd213bb04

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