Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f8818d8dbff933…

MALICIOUS

PDF

84.1 KB Created: 2021-10-17 07:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8918a51d699e8e3121a510dd5d6be506 SHA-1: 39f445af933657b9729da9cd45a0b1536b252941 SHA-256: 75f8818d8dbff93387dff38971db8252339e4a625613a8c8db164ba83823b5f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm on disposable or compromised hosting. This suggests the document's primary purpose is to act as a lure, likely for phishing or to distribute further malware via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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
  • 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://mondoacquapiscine.com/userfiles/files/funiz.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5298bd3f2---guxunipob.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/72628445874.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b2b21ee777---34610982271.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/12316721738.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/82841104303f2b24024a792f96c0cf93/8893760529.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/28269031335.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161488849d8ebe---jenexenogineb.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/fobinegidabawumunizag.pdfIn PDF document text
    • https://chineseclothingonline.com/File/gowofuluvudadatoz.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614088b610c1e---mexadoji.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/tewezeb.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161593c58babff---dopiwubewip.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/25834214328.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/27132472042.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/24448601838.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16162ae2b7f836---dudejawuge.pdfIn PDF document text
    • http://aa-nusd.jp/jibali.pdfIn PDF document text
    • http://koutingchina.com/upload/files/pabegugozaz.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/25463728452.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/pafire.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/bimakiledotozajibubapamu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=kanye+west+college+dropout+album+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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 18292 bytes
SHA-256: 7b9a5752cae6798dabdcc5098f70b129d8b82c60bddafd5494c9cc5828b02e42
font_01_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 11196 bytes
SHA-256: 000b09d298b201bac4721055483e4a5268e675fd1190785e94554a3e0cfcf597
font_02_sfnt_off00012aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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