Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d23f19ca2048298…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 04:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6a283ef6178658b72d50f35323af0624 SHA-1: d81c9b8e67d4bb32a6a51aec9edaba648ad1d4f0 SHA-256: 0d23f19ca204829881aa11ee55e496eb22a87ae4f9c5beaca9a51789c20e987d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, several of which point to compromised CMS upload storage. The primary function appears to be directing users to external sites, likely for phishing or malware distribution, rather than containing executable content directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://paroles-vives.com/ckfinder/userfiles/files/67088466952.pdf In PDF document text
    • http://msamerica.net/clients/873634/File/95274694796.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/jutarikutovina.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/24963638470.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/2ae72d9ca42e67a3670e22743542dd17/52472642671.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/4162837058.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/zapowugotoxekuvedawumev.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/40582829343.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5ddinhg44lc25c8fr797s6fbc3/penadikewiworaxopeseter.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/rowel.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4198120c56---54387417623.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/1198747141.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609942cbd1185---51826773079.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ka8f7mvclf9hvga79h3929uir7/24143001730.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/ralawipojowobigumigawi.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xogudenabeziluma.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3466516286.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/93844356928.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8a61b122d---12966481233.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/tapanixudumifivabisodej.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/fafilafikeniloluvis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mercedes+truck+parts+catalogue+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_off0000c70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70E 17524 bytes
SHA-256: e79a4beb739f380b92c7ddc51fab204dee4d5267ee0797ec46238573b325cd0c
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 10784 bytes
SHA-256: d38da1bc76231b7e65c7f4b93497c7c135f23dbd4ceea5511f6549501cc6d809
font_02_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1