Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d102741e79c10a…

MALICIOUS

PDF

96.4 KB Created: 2021-06-18 23:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: aaa94a43af0ce6e77bb8d7c5867e6ba4 SHA-1: 34762a1daeb1e9b1bffa53c25c18303befd17c2c SHA-256: a9d102741e79c10ac4a4ecd1ae63a7aa2e645d282a1022495c623238d2c123f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4d2dc2739f2c6dbe3823bb4c3a19d10a/32374369862.pdf In PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sefatuminelozoj.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160877f88260ac---mevowawevavikifogemevila.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072884f0511c---ritudoxaw.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/xavanagidozexesowiguleroj.pdfIn PDF document text
    • https://biocoils.com/img/file/78526279150.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/2008592477.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/92671628387.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a0844f63ff684775994e55773c0084ed/93148969908.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/36338618240.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7a516fa9---vulab.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/3ae93929aa3cddf395d1d9ae5858ef27/lijezamaxudefabevuzefirap.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160abf846145a1---tebunebilope.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160808911bf210---48015163858.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ec7c144e---33043176514.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/98297890722.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1945392d---fuwivokixilupumewo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b870b6ce460---80085177800.pdfIn PDF document text
    • https://agermag.ro/mm/file/26821526545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=namaz+janaza+pdfPDF 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012e99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E99 24820 bytes
SHA-256: 96aef312e340ffe95f1fd235437e71f3342b6e4f286d110731abc7c7f9be48ed
font_00_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 4976 bytes
SHA-256: 3280bfdcbf5bffae587a4acb4117b6aec1fafc51ca8c707728bcc0ef20b66a11
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 10716 bytes
SHA-256: 9b2acbd3890f3ce0a34750b2d1e40d61a3ea4575f3886477b62b1a9c98ec5f19
font_04_sfnt_off00015a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A45 7348 bytes
SHA-256: 9b2407c88c98c56d1c1d0dffba963e5763891ee35d99df9dc51434ae7beca06a

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