Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd59c1b28d41a4ef…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 14:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 791badf804c36913f3297a9c5c37c6c1 SHA-1: a6690b6749e4237d7e48503eaf3b2ba7fa9933be SHA-256: bd59c1b28d41a4efde4dfa8acd05d3dbbeab3207d40927b31ce963fc62cfb368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further supports a phishing or malware distribution attack pattern. The primary goal appears to be redirecting users through a series of links, potentially to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sriraghavendratemple.com/ckfinder/userfiles/files/85600897243.pdf In PDF document text
    • http://vititanon.com/user_img/files/finakus.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/sofanututaguja.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/zakazujir.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/komovokiregopa.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/32948088290.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/satamar.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/lubugenarogotavunigite.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161429b09987f9---kigab.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/71556416740.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/14354914339.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xebabuke.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/46187636337.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141aaef8042f---wuzawukipadodipedi.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/35080482628.pdfIn PDF document text
    • http://1careglobal.com/upload/files/70275128525.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/6048177538.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/98840390986.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/29449050610.pdfIn PDF document text
    • https://cargobull.cz/res/file/jozop.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/sojelif.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/86024893680.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9da18107c136d97970d441d0b65268bd/fetedegij.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613afbc0cb19a---26679808711.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/35458567175.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/fogekamurodono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ielts+listening+practice+test+2021+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 10920 bytes
SHA-256: 05d03e3319abcf504e563d65fc5b61228c052aabdc694c7bd0c53c76dfd8d3e3
font_01_sfnt_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 17588 bytes
SHA-256: c2964aed61ed87c30ff21c68a89a56dfa177c6b81962e02e18f0aa8a05a031c7

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