Malicious PDF — malware analysis report

Static analysis result for SHA-256 341e258ffff6552d…

MALICIOUS

PDF

149.4 KB Created: 2021-06-15 11:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7c90dfb909b9492394f58e0f1820d859 SHA-1: 3dfbfa59c1f76bae293bd1cf51c8ee42e79e1aae SHA-256: 341e258ffff6552db03aebbe7a206edbf125cea2f43bb259dd9fadeb45c46e62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm patterns suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=meteor+garden+2018+ep+9 PDF link annotation
    • http://houselandia.ru/files/voxuniranexezobaxulamu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/89169b5b01883dec917b2b3a33ce9131/ledudozilum.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af175789f5---mapofefidelabepibaw.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wopurinuzovujuzolo.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160918cb7e19f8---75059426945.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051222341959359.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ha0uq3dj39brglq8ieh4g4f591/tuzopupud.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/009a29b16ae5e831b596621d99311eff/89442448047.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a22afc7fb87---sozoseduv.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/fuxazipulojotuzoxow.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qv86u1slcl9dei5s026rf9c2s3/bunazimuzajudusi.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a79bea4d7---wipizafuzokarevitije.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf51256927---zizabomojipujureb.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/812d62d46eb56b14815164c201b9a93c/guvajomuwiwamegajumujelo.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001eb9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1EB9D 10204 bytes
SHA-256: 6a5c350998413667f256371289febe3101af0ef74b578ba75c0e9c8d83aec83f
font_00_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 72200 bytes
SHA-256: abd38c5d4026a23d28d91728de2af5c705a9c5d2d1f59cc980e700e59e8fc605
font_01_sfnt_off0001d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D87D 5600 bytes
SHA-256: 121cdefd5850aea2a08433bc148dc23861f87f444a3cd93439b45f5901652822
font_03_sfnt_off00020888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20888 12208 bytes
SHA-256: cc5fd2f97bc1ecdbe7a59d9ed310b05e9cec6de4cc614b6c3f62e7fa8fe0c0fa
font_04_sfnt_off000230c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x230C9 16632 bytes
SHA-256: d6aeca2d71d065aeba00d03c50d672d3ba05f186ce264dc70760bb3990d11dd0

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