Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4d60a834c80ddd…

MALICIOUS

PDF

70.2 KB Created: 2021-09-04 05:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ba31cb7af8b0f82e5238214698db527 SHA-1: 5acabcfeade11deaa42137457c44ea2f06564cbd SHA-256: dd4d60a834c80ddde50617c22907ca0bbfd786de5e88f6a58c5558620744271c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://teraval.cz/res/file/1070440551.pdf In PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210806_CC55377A6785333F.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/71102965356.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160875f31f04ab---74408476725.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/84266189881.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/dexunagexagomotadifa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1611faf328fd18---vazujiru.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/83749997590.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fd22d221d42b4ed8cb9f1534a8c9544a/315593480.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8rs0mto1qkjs32u6lbupfdhlgo/femazewiluzagiri.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/6ssqf0huh31rf96ar6h3qp1g5e/18897023320.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160829ba8794bb---15909673588.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/7dbtf8jfuob6datfvtll84s00i/5806616976.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/92542851507.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607776eb3d7e2---38953493214.pdfIn PDF document text
    • https://afayl.com/userfiles/file/91402953404.pdfIn PDF document text
    • http://matras-devison.com/upload/file/jomamugibep.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/misagatubuwegam.pdfIn PDF document text
    • https://efnnma.org/files/file/90847249102.pdfIn PDF document text
    • https://medtek.vn/storage/file/35603331001.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/pexijitipusosirafilaf.pdfIn PDF document text
    • https://shopabrang.com/images/files/zobomoweguf.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/visaxefilap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vw+touran+2012+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 10324 bytes
SHA-256: dc8c1b0583a85cf79465cd3196b948af176151b45be05b8c9163248b04fbcda5
font_01_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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