Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ac0de298c68f37…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 18:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a427325f586110d5cbe81fcec9e3b9ab SHA-1: 3fc08245f0f09c6cbb8ed05a0e39cf9c13773cea SHA-256: e8ac0de298c68f37bd52d993674c98f54ff0184c4610f29ebf6c271f04d49e91
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple disposable hosting sites, many of which are compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m6r0lee9bn78dtb99a5s37en8j/naniburofej.pdf In PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/fedejimeluvazizidise.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/xidimugigofujapojedu.pdfIn PDF document text
    • https://edgecs.com/documents/kajemudizabozuzubegarani.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/nozaboligijizapulixeda.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/fugoladoxo.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/varevefezimu.pdfIn PDF document text
    • http://cartopack.com/Images/file/39003183894.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/pqqih43t601elk0n9jpuhpq24q/83944277590.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161380f4b65fa9---59118710605.pdfIn PDF document text
    • http://kahasat.cz/data/file/55375170903.pdfIn PDF document text
    • http://mq-water.net/upload/83348654004.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/74331219491.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/285988818cf931169376ac2c21625144/33997895335.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/befizuligevinovubotesemu.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/67170786580.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///72136190924.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/zulebakip.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/25868092968.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/zidiwivobukawa.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/73024148741.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138424cb4a29---92789088692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+secret+garden+pdf+downloadPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/92541233278.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_off0000bf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 10856 bytes
SHA-256: 45840b70cb8045f8cd80f67d7216659905e4114b3bd77d4da2a7f899022ae171
font_02_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 15916 bytes
SHA-256: abe4a7ffc5b6332b1e695d84cc960b1e7b629b328ded443b347bee60fb258e88

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