Malicious PDF — malware analysis report

Static analysis result for SHA-256 584d3ce2c423e4d8…

MALICIOUS

PDF

112.3 KB Created: 2021-09-06 14:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8aa7a051b1e5fb507436d547ac101af5 SHA-1: c81045d5fe2dbd067c6d6d82027aef489a210aac SHA-256: 584d3ce2c423e4d8ca3d8044f80b37da392444c287315f608af445f09970f0e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate the PDF is part of a link farm pointing to compromised websites, likely to host phishing pages or further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for redirecting the user to one of the numerous external URLs found in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://wastran.ru/uplcv?utm_term=an+introduction+to+mathematical+optimal+control+theory+pdf PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/453a3f4e376b65ffd77ee3eb81f8a1ee/pogujejobadobawokule.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/2723ad22e4e97dbd5eedc5f320711307/mexagav.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/vururajunavune.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/debujapabamujotojebuvudud.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/48042797296.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/57846421163.pdfIn PDF document text
    • http://uchid.com/uploads/file/97101611348.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f41a3b38d---dibadowedisekeberakelebi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7db4c557b65664f43c18a6206777044c/86148713765.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28e0f071e---68214342130.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/fawigulon.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/wenidaked.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/foven.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/jiliwanebosumudizesukajur.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/85329914449.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071368685ad9---32136897205.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861628ac3d8---25350893350.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nevirowikalox.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/paminen.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/46635750824.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/kemuregupimanominorusow.pdfIn PDF document text
    • http://surestegc.org/documentos/file/76804920491.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/cb0deca4e88d33838fdff7791f91ef85/nijigupux.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/28445943417.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/tikora.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/wuzuvaruv.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711669db8b2---gasewa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001331f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331F 17812 bytes
SHA-256: b53f40b9eaf911c6a940962bea0bf3fe214b9d38008977cf06a5c0a5e71a2d28
font_01_sfnt_off00014eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CA 10912 bytes
SHA-256: c2ef75572ada8dab7eb810d7b2fe9e02030b858804db1bf1f0a3d099f1f8759e
font_03_sfnt_off00017fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FE5 19208 bytes
SHA-256: 175cd8c686b6d584ef9dd717cac0181c74c11195d57f1620819ae96640ea372a

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