Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c903ac3d1b9e9a…

MALICIOUS

PDF

91.5 KB Created: 2021-07-07 18:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d2ca87e3e7ff50c7d002606a70416af SHA-1: 3fe0f9d371150968cdc2c766912408e565dcfdb9 SHA-256: b1c903ac3d1b9e9a7e53b185498421a397e3de2b5c2ca4dcbbb571ce26c01129
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/41eb5u6cenmq6032lqm6htl0lj/77245920988.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c65440e1af9---27857051457.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/91563985281.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/fm0p7f0vf9smrloumic7hndbj7/ginijo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23dc2b84c7---31296952882.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/ratowedozat.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/mabaniruzoremimojo.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/15114815111.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/fenulakabakigubaketigawo.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/55126997878.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/dexafitum.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/91735311514.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876a4beb5f5---33961984423.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b257eb5b24f792b07785acb8efedb4f/19521348979.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca85dd6a6f---42332934649.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dufer.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160878186ae83e---nalonaguzomemegolabunel.pdfIn PDF document text
    • https://viettrungson.com/media//Files/94494224699.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c5b9476efcbfe33623fb2d0543fa469c/dipesivugutukarofubasa.pdfIn PDF document text
    • http://susutour.com/userfile/file/73845505314.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609df08c19e34---fukoxiretulivusezovu.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/solobipejojemirujulo.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/vusukonadimeduxedopo.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/pibujorafobifarib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nss+manager+cheatsPDF 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_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 10396 bytes
SHA-256: 0be6a525582e0a87e5eb8e81e4622f824448de7747ac6b96fd81152830334bca
font_01_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 20568 bytes
SHA-256: f7d3d0be1393f6aa6fe0f9d6d0f7ba262cc5d7a9fec1fc8c214889a9c3f1d7ea

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