Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a06b5c5f6a69635…

MALICIOUS

PDF

93.2 KB Created: 2021-09-23 13:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 603e5e836a5b6b0cd8f18dab67a159be SHA-1: 1799335ebecc6b01ade71a6b39d8b85073d3679d SHA-256: 7a06b5c5f6a69635825e644d2bdd37763ca539d4fd5fc444b2d8fffe916a4d6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=sincronizzare+android+con+outlook PDF link annotation
    • https://nulifeus.com/~nulife/userfiles/file/vakemebanutelonu.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/sikokisotoxut.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/zaxomizezeteredisopakogi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5b2497912---zuxadokisojosuraradunepu.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/74614995263.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/19693007277.pdfIn PDF document text
    • http://qdjshg.com/files/file/kovetusemidi.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/juroxixuwobozuw.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/vakepopalagevubo.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/96587375574.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/pilabamanimo.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/mopoxoganidupedaf.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/64215141301.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/68758391991.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e8ab16571b6e118ffaf4e0f28f8b5663/monalisanimaxopulume.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba5068cced---31049711921.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/wizol.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/35301648350.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/49616862790.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/74301268634.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/29851708615.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/durijewegibuwotos.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f667c95a346dcaa73ca4df16affaaafc/pewenokud.pdfIn 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://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_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 19776 bytes
SHA-256: 626eff46e0704e20493f1747d6a5d366fef6969663a3fdbce30fe0612cef3f8d
font_02_sfnt_off00014ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE6 10524 bytes
SHA-256: 768db1a16ceabdbbd6bce0158375577d49385a9fe8e6b02f038b1361766aa9b6

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