Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6e38d8691aea04…

MALICIOUS

PDF

93.5 KB Created: 2021-07-25 02:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d591ad8feddecec19d5289d54381e81b SHA-1: 5551ac3362bbaa6e0cf81011ce1a7ebef7ab23f3 SHA-256: 3d6e38d8691aea04508867b1f83cdc826e2a184c4f2b18476b8dea4769a436ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm with numerous URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to external sites, which is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4524e1d61c---62058698868.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/tovufobepotimom.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/s0mucdmmqv8b6ra37rkobhdv0l/lujadabixowo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078937ac6e2d---dabagalu.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/fezuzupoxakatuxumudof.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/20576948554.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf091554f---21923701340.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/66416894217.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d2fcd7f0---38305128390.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160964ef6ea49c---98085047041.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/58b6fa4e39eacf38e9e2158cf117ebc7/54690605771.pdfIn PDF document text
    • http://candientushinko.com/images/file/poxotewupinuboxuxoxazuwix.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad545db7e6---26062076948.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/wujagifagopijorevivoxina.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/21651818408.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/riwogo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/29194619290.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/18371088650.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/33275828fd554bc65ce1a52934dfb7d5/setenoxisokokesiforuleji.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8255de33b---52843666243.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/89fb11e544aee4cca63cba30bc60d2fc/30960945372.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/95429958141.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8b47bfc1682bc38ba60847ec07b29bec/guzonusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cuanto+capital+se+necesita+para+invertir+en+la+bolsa+de+valoresPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 17904 bytes
SHA-256: 30e86b3fafad834a9e5e109fdaae5538a0a40f415a612c2417a12b39a2cf5cf6
font_01_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 10844 bytes
SHA-256: 97c24d9fd36be0686abd5df8e08b0ac7dd49903422878863d94ab4336af6e925
font_02_sfnt_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F25 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d

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