Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3234cbc3f169e00…

MALICIOUS

PDF

100.6 KB Created: 2021-09-04 04:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d53b01fc70884e38173ba058cb10460e SHA-1: 89be397e4bc2ee1e210ab8f45e22a38f24217961 SHA-256: b3234cbc3f169e00998fd0aed8fdda603f14b809dcc8198d2bd5562457b8b303
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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://gmart-express.com/demo/uploadpic/file/10245255384.pdf In PDF document text
    • https://davidfoleyinc.com/userfiles/file/denisari.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/gamerowomuzulafazikar.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/27755139374.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/bagovogutew.pdfIn PDF document text
    • http://ewtch.com/upload/files/45851323851.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d6d70dc32---37089379772.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6c6b147a208437f46b581bac6699b935/51375349148.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/50034acd29c7cad883b864cba5484c11/sojalenumiji.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaba896db1---kegujumomijedaz.pdfIn PDF document text
    • http://erex.hu/upload/file/nabavugudikajom.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce68c7069---zubeguduniwisoxag.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/31437764624.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3449a98e---kobesuzetutanodexineguxo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bnja9l5btfl525qqa6jbf83m5j/42316278999.pdfIn PDF document text
    • http://jarosi.hu/files/file/53828913271.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0baeb694---rezebosupapi.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/bolimenivosasanigagujur.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/3651377774.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b466fe42d175ad2285a016c7d89bccd0/dofujizitubapezekez.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/63930317907.pdfIn PDF document text
    • https://beaszemin.com/files/36319268848.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/79741848053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=harman+kardon+onyx+studio+5+manual+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 25624 bytes
SHA-256: 3e1f6d34dc600b749d1e5d2475caecdf97ed05157aa5ff157fa4387cdaf64042
font_01_sfnt_off000152dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DC 11060 bytes
SHA-256: e8718f817e007ac6e25af322883783d6dbddd3cdaa340b895b62340db969de41
font_02_sfnt_off00016c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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