Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7c70fb0a85a09b…

MALICIOUS

PDF

98.9 KB Created: 2021-09-01 22:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc0d0126eba328ed9f58cdee48880b55 SHA-1: 06eb293227a524ed9a6c16fbbf3a1eb06fd286bf SHA-256: eb7c70fb0a85a09bb238eb91d716b452d49bb89eb5ae465632723fdf8feef00a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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
  • 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://bannhuaduong.net/upload/files/25644011058.pdf In PDF document text
    • http://plncse.hu/php_data/file/piwefewogugudovejunir.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/jusux.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6bef2cbcd---73473181565.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/93260930948.pdfIn PDF document text
    • https://new-baby.me/userfiles/file/33270982757.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33e5114ca1---96009110141.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfee794749---naxokutirukurekufiro.pdfIn PDF document text
    • https://cargobull.cz/res/file/71956703293.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210714071707.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5ntljac7saulenaspmg6hsmqm6/46061597848.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fac0db29136f86bba9f55fc07ab2f6d1/50018061644.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160746c3d6c363---rezipoxali.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611573d4cf637---82964167835.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/87012156283.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bopowidivu.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/suwubipamifemogovoket.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611c5c22e23fd---kapejosujupojupas.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbfdc1599---9681391360.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/16702504155.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/92ffe2a57ce840aa859040628bf1a38b/3091187994.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0d61c774---60791071467.pdfIn PDF document text
    • https://shibbirs.com/media/files/9442172136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+factors+affect+the+temperature+of+seawaterPDF 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_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 17656 bytes
SHA-256: 9ce17d292015365851e149333cfc114e9d1aa922c2123778a98592fa471ebbfd
font_01_sfnt_off00014cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFD 10684 bytes
SHA-256: b98f1b0f5d175dc615337dadc6c0c69dc7ff0c3f6474212a3bab41366c3c1666
font_02_sfnt_off000165a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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