Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed96d73f3bdb29d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-11 13:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6d4c52ea70512037382b1dc834a7d14 SHA-1: b46c73b2a96aaec881ff0dfbd1989f294e761a53 SHA-256: 4ed96d73f3bdb29d6b2afbb102ea867cbe05c68c4a2b45a02ac0f1d8c9abf978
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://studionegrelli.it/userfiles/files/64421975469.pdf In PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/jonijazuw.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/54097684311.pdfIn PDF document text
    • https://sadex.pl/fck/file/saduwazixuvutafanexidurim.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9b714828260a7cb92b34b149a4e5a8f1/39767475654.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210907084804.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/81586059227.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613011058e18d---81518883415.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613be94e2a5d7---niwaroxitig.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dd3e435e---senerakovasejovepeniseg.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/kamebisubozeb.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/33562879022.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/77479631855.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/juvet.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/tijutozi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16131fae8c7d04---gufaxomeganikafokoviwuwot.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/25697807175.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/wanoxasedibevuju.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/41354545451.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/25198938542.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/dejavaliro.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/limodilajirav.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/deponawigepezapozit.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/73714028146.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/29564251851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=v1+golf+app+free+downloadPDF 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_off0000b0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D4 14476 bytes
SHA-256: 5c08e928d8d8ad5ebcb0d9d1eb2875ba1ba0f1d5fa2ddf54a6d2c80ba83cbed4
font_01_sfnt_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 10420 bytes
SHA-256: c7621304719202bf7b7aaa9aa0d742f93867e408707f9e159457dd214d400a01

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