Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51e3b07563bed32…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 00:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f522b4ba5c178cf39c3a94fc0df1f371 SHA-1: 4f84a3d93b839c16a11e7c132d21a84aaebd3ccb SHA-256: f51e3b07563bed323354c22e1e75ee62ce8c7769154cd16ffaf19d2924dbfd5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pistant.ru/uplcv?utm_term=borderline+personality+disorder+in+adults PDF link annotation
    • http://stonebreaker.at/72377997283.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/faponu.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/71439183925.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8614f10474---5279539118.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/wubalevizanironujufudawob.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/31392854921.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece53ea99a---vetav.pdfIn PDF document text
    • http://belst.by/upload/file/20537101540.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ee6d290f5f1034645a47a599380bb8f2/lewewenogelafaxevape.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7801e3bc7---wajuvavusapiguban.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce7e34783---23543226652.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094565f757b1---59951012761.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f67fe16e051c0b6e26f95e4372447072/tadodanab.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qn5l9spkr0g9afi2gquu0ip6ep/96153906662.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb1b1d67b---14494930425.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d3ebd516d2485ec6cdf1fc27a2c371a4/xivunofa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/28aceih0kgd6m2jh1tffp95qo5/47714753788.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9f3cf3c9eb18c33bfe0f6bb7b9f55e52/61224681476.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/tasazefex.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ca1c9f17---niwesijevipozido.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081a42c02fda---23465582980.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e6d74e7d709d1a63959f0d7311e52ed3/depuwejalelevo.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/suxoni.pdfIn PDF document text
    • http://rilta.net/userfiles/files/nubezimorenelezipebe.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29afac15e7---49374533241.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f4e5f6c9---bapodoralixetobapuvobowa.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/39030941089.pdfIn PDF document text
    • 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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 16672 bytes
SHA-256: d568b4f606efa857fa9fca21f3942054af00fe594f531a8107bfdc672239f37d
font_01_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 10652 bytes
SHA-256: f136c60be94f6a7256f23bc520ad6c95ee9bde0ca43c794eeae4dd78489ff5f3
font_02_sfnt_off00013256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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