Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca651d984c46aaf…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 16:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad3935f7d612712290aa7f4585ff3539 SHA-1: 3e42f1dcc94d4b0393a8ef87e5b4fd412ed6fa70 SHA-256: 3ca651d984c46aaf33fae17244fa462f32101592744aa416e402228a3034fda1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains a link farm pointing to multiple distinct hosts, many of which are likely disposable or compromised. The primary purpose appears to be directing users to potentially malicious content hosted on these sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://saleskerala.com/ckfinder/userfiles/files/jatibumolege.pdf In PDF document text
    • http://arcstema.com/userfiles/files/91236897638.pdfIn PDF document text
    • https://tckontrola.hr/files/suragekunuvubofo.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/82285753992.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/jagotanaf.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/138930c96ed002b5cd998f889632d7c0/7763638318.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/7761482007.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ecd84038c---70891192060.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/75081984930.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/6537487508.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6903881f87---7385065628.pdfIn PDF document text
    • http://goldmustang.com/files/files/29897588036.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b396b5fdc7ff2ce842ab1ae1a0e095a1/61144780216.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8b30943b630153754e29ea9b2890d715/nisalewojowupofur.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/79882505032.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a33dbeae4ae711c233edade697c2b3fa/sirugotuguxepesaledebam.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/98610982641.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216c0a1a46d---63570806128.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/ximukakudexadoxutom.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc0bb25af---69472927178.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/babituxezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=addition+word+problems+worksheets+for+grade+4PDF 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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 17648 bytes
SHA-256: 86401832cd9c574b382b3cb2e23e73812f7abc392a8f163e6e2e7fbdb9dd6e07
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 11324 bytes
SHA-256: cf85d15ed945579d9411e02d17186df5bc1ff2aad6d59ca5d97fae0b054e0de2
font_02_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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