Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7f74efc605cd0c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 04:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a67f1b89924fe9f1e9a69327cf4195fe SHA-1: a628cbd7ea953e8fcf1fb6e5fb6a742bef036941 SHA-256: 3e7f74efc605cd0ce636d24931277e9d4972cc98df78f38162b84aacb465fb62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The file also functions as a link farm, pointing to numerous URLs hosted on compromised websites and disposable domains, likely to obscure the ultimate destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, possibly for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=aplikasi+program+android PDF link annotation
    • http://stattus.com/assets/file/pasigabum.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/14381196048.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f79e8c538---wuniselipek.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/10061830320.pdfIn PDF document text
    • http://ativn.com/upload/file/lebibuparebexasekog.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/90100596980.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210921144903.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a1f84fc30ff9056aca262e9730bc30b9/ribokug.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/23746799931.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/69794458392.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/45283712956.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/mebivebas.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/supaberagib.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/32711958000.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/36454745533.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/bekatemawilegekokara.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/q9a98rpmlfkupi04i2u4rd8h4b/55412410158.pdfIn PDF document text
    • http://uteambio.com/upload/files/tazelewoxoxewufaxet.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/nexowazaf.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e53a83cb91---29709848033.pdfIn PDF document text
    • http://mylodge-naoshima.com/36736797768.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zopalot.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/40734532306.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/gilusovufunudeduworul.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/xotanixevugo.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/mizerut.pdfIn PDF document text
    • 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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 17156 bytes
SHA-256: 5b2462a77bfe0783dd5de416179a536485cab26645307fdbe8f69efb931cf3be
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 10576 bytes
SHA-256: 1d7d8b36f511248302ddd7948974752f01eedbedb878e5926ffd85c4fddd1189
font_02_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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