Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82e5163f19edc6e…

MALICIOUS

PDF

92.0 KB Created: 2021-09-06 02:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2088b913ea906e745488f0326217bfcf SHA-1: 71548f114a923900409e010a0df6af938c4a0016 SHA-256: b82e5163f19edc6efdcf68300cf2b9c9642cd34d2d77a2d624016c9d8657167e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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 http://www.pattyn360.com/upload/forum/files/jetibulewu.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k3aijnh30775o6l55mfh7k5agj/94572129487.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/dinenobikas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b63892f4---dezuwora.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4764f18ed---romabujifedupozutisadadow.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a9a404c11d55379741c977114af199c/kekurodokenubezejibara.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/64390203282.pdfIn PDF document text
    • http://montri-inspection.com/naichabub.co.th/images/upload/userfiles/files/99841883749.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c352e4bf1---68966346420.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161261885b2bea---36154388743.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/zirelulirapogexolunel.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410bf73615---30696142173.pdfIn PDF document text
    • http://skisun.it/userfiles/files/legaji.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/bezatewuvo.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210825200054930.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16263468278411.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9ccc29f1618ff2f407a71e0414aa2b8c/wajavuniwojetejipalelewaz.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///jogutefusabatomefi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ogh42adpj27qqn3n08d3allr6i/11663001049.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/50c2492a57018c3872fe5058565b7717/5214779281.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/depamabagug.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/siwagameginikawotoko.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/29857158447.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071d077b0ac9---rajesigewijopajuxebusur.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607656b52b82d---sujumabijevuv.pdfIn PDF document text
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/zijubedekolidaroluv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mikrobiologiya+fani+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_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 19528 bytes
SHA-256: fb17a5d3dac12de2a8db36700e41771be13f958b9f8cbcf2f99f3d0ad4d0bc4a
font_01_sfnt_off000132c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD9 10616 bytes
SHA-256: 5571ade5d7bbcd3ac1e8e65baad7ddd8f748f81e9e641c6473ebd14008e3897f

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