Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c71a11e4238f7ca…

MALICIOUS

PDF

71.4 KB Created: 2021-06-02 11:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d910fd4316a6ea4d909fc852db64f1 SHA-1: c56c87ba445e08763f2417e1c40bbb15cc0b10bd SHA-256: 8c71a11e4238f7caa74fc4ee3cb0c797daae6c3140f5a4e5fa8f175c6c84404b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were extracted, the presence of numerous external links, many hosted on potentially compromised sites, suggests the document's primary purpose is to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://acecaalcoy.com/userfiles/file/mifeveripukuxomujej.pdf
    • http://pressvaluation.net/userfiles/file/zedaxididuririgozakifa.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087182ccfff4---zisepekojuzitodezomezar.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/iapf7c1hhcqf1j2bubh4bavq04/21370256246.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/21556c9c109ea03a7365e279fe01d1a9/xonitujo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074761f56c99---gadovoripexelifuti.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e145836552---25416685590.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/305637babe6bf6b75fa916c9ea0f8dd0/67017844468.pdf
    • http://brandnewgoods.net/userfiles/file/fawovifapul.pdf
    • http://myucmas.com/userfiles/file/45470020739.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9eb76afb2---60258026522.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a058055c768---durajugakuriwafewo.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/thlnp0lt2me8phc5h7csab55cm/jigezav.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c7f82114---36552969789.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872297dfcca---72446278573.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fox+sport+2+en+vivo+por+internet+lucha+libre
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ba.bin
b530885b15e4c40bf28a258a8076f698f1ac306d7265c8649daee067042a7ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 5376 bytes
font_01_sfnt_off0000e704.bin
e9977be39d8189bb1f2106ab47eeb73306513a323cb186026adf730e14df62ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 12224 bytes

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