Malicious PDF — malware analysis report

Static analysis result for SHA-256 070916d44b232a87…

MALICIOUS

PDF

89.2 KB Created: 2021-09-05 22:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b2623308787742bbf29dee59264d3d3 SHA-1: aee5def671321387c3f478add64da54ca23f4908 SHA-256: 070916d44b232a8774f9d7ee4fb5b82412a26ca942250be37a06db76b12eab7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://masihpt2.com/contents//files/39314267041.pdf In PDF document text
    • http://simkoongschool.com/uploads/editer/files/koreson.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/tesabofiguk.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/danakominajezi.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/jodupax.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae588d9c2---gukona.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/40306691525.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2e7929f73ebae1c88ac8724e729c796f/rifukatenifalewel.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/76138966199.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8bc1bbd26ada633c9b7df17f34ffbd91/gukixujibemivoj.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/pasaduvubigopazevetofitug.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a6b22ebc---pikifili.pdfIn PDF document text
    • http://mesterek.net/tmp/mivugujapovefu.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/nedusam.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b102013c60a---jalekunokiwovipe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lhiejjv71d47s37fsqc5o29p15/69064390660.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21051009585135268210d7u9.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/sajunekimexurejuva.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/dipurimovomida.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/kakovefi.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/bizepasoliribizi.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/murofajovufisefadupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=logitech+craft+manual+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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 18196 bytes
SHA-256: 5f039750dafcd2b7a766e7ca517698b4dcdc075fec93aa51459db410f9bc9756
font_01_sfnt_off00011363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11363 16824 bytes
SHA-256: b60fa25863b5b34ab62d4d47b8d576e910628fa93c3ae7a2dff01f2950e16875
font_02_sfnt_off00013ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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