Malicious PDF — malware analysis report

Static analysis result for SHA-256 e803135b76fa6ad9…

MALICIOUS

PDF

62.5 KB Created: 2021-09-30 15:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d685248b6b65433283b8c0e931449f37 SHA-1: 9a69397d24f05ce3ceb6f29a818c23360ca24ea4 SHA-256: e803135b76fa6ad99ada2fd60dd7585b421932b5045a92c237c658cca43f0578
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

Heuristics 5

  • 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.
  • 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://inlovehuahin.com/file_media/file_image/file/jowuxuwuvu.pdf In PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/58216894691.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/fasogivomifulafiridotiw.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/ranasubomibapezadir.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed2d58955c9123e4fa94629d84edaa5c/mutemowagobetepo.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/pefevirafaf.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/62588049980.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/nuwasorotigaf.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/24571845565.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc57f0640a---69497055442.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pabuponurakufefolig.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/74714908780.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/33665307129.pdfIn PDF document text
    • http://kechengchem.com/upload/files/vomoro.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/favuralasudifidapu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/fisageleterug.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/25156959503.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021917125431.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210905044452.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/kagavewisu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6dbdf7c46aa7453b57b2a19117744f83/vafebanaxamig.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5788df9384500e0080ea9b518d22f2d3/patizupuxe.pdfIn PDF document text
    • http://vasa-project.org/fckupload/file/66234393452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dragon+ball+z+cell+sagaPDF 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_off0000ae5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5B 10416 bytes
SHA-256: 34e957558ba7ad0f811661781259e065a8a84e987b591708a5ed83326cf66ff7
font_01_sfnt_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 15544 bytes
SHA-256: b7837cbdb1696fe4ad4c621b7afe74b82bf9d1c40c38ff1126c0da3b7c722a86

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