Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2f51676e6bab82…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 21:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d80ff7ab78b6bace50ffa70f47a28ddb SHA-1: 18af90b1f5657600cba0492dd1fc5f7a3f09e235 SHA-256: 3e2f51676e6bab828b89578a7c2592dfa4a876a41089f5b8371a16fd4f5dafca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains a link farm pointing to multiple potentially compromised websites, including one hosted on a compromised WordPress upload storage. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krone-murten.ch/userfiles/files/87398917304.pdf In PDF document text
    • http://kzlo.pl/fotki/fotki/file/79723856490.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/92466995613.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/096319dbb758ce114040e028ed3a3f78/muwebufe.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/67364892296.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b165dc9fd25---dotatu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0ecd0a81---91290207624.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/rodadufilugejogajobaxuf.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/92529898611.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/bezagomekapesovopuni.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7528fde34d6bdbde8691ea02cf44f918/valoxidovubep.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/24128437002.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/20082490974.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/68084449715.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/diwezit.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4614e2c48a74e9f9eaecd625a5b52842/22253973326.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/32433090047.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/76414251767.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c3004d6106b2afbbdb07e11c0e215dc4/resanutipusejabol.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/99255312334.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e8ad712b7fc09e71b5c4b30427d2ff25/90223151117.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/aff7fe63f9981e081397dc2ac826a3fe/janoxolujojetutitud.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609141e0ccf14---nidar.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2dlt37ebaht7fjf4i4sbkdfr32/nedadinituginadudaniwim.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/82jomh72e6m4gdgequae7bplep/telizibuvebeza.pdfIn PDF document text
    • https://shunnasato.com/63379498249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=halogens+displacement+reactions+worksheetPDF 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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 18288 bytes
SHA-256: 9ceeb6c9d51c46b572660bdb6f1a2c10d8e75ad3bd70269c9522d7897bad4797
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 11132 bytes
SHA-256: 75a9a33edc8fbc113e6e289c040d94305ca847304d800f951a42da4f25ed73a1

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