Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dc9403b722cf51…

MALICIOUS

PDF

134.6 KB Created: 2021-10-11 21:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac6ff968ce0d08add5d16417c3962f50 SHA-1: c93e5452e1882d198b73067f6e70de6b98c6f46c SHA-256: 41dc9403b722cf51d15c3473ac6f5543ab220e74edd1f6d53915608b12b065fd
154 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple external URLs, many of which are hosted on domains associated with compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6366

Heuristics 5

  • 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
  • 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://hcvitamin.com/webroot/img/files/55071767901.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f80c7b172163cf3670c6dd5c34e72f9e/mekewijorojivisis.pdfIn PDF document text
    • http://ahaadesign-com-tw.sales-frontier.com/ckfinder/userfiles/files/9418844638.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/44783131216.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16151cd1b134d3---samoguzeveganulep.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/natigovof.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/11410302429.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/281qq5cvbt1o7tgudcech3jk5g/58086683815.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/79207784984.pdfIn PDF document text
    • https://durimawar.com/contents/files/6978605220.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/fejiba.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/vakofevavinu.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/40109139513.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/goven.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/50477348255.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/gesogeborazapukabaf.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/veziwaxil.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/rodijuvuxakomijeminore.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/virikiguwekonomo.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/18674635118.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/gejifogiwojigo.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/42261622294.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/paniximevajebesusi.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/79434709115.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=thus+says+the+lord+in+hebrewPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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