Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d608f6e70d8b05…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 00:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be3517e255873a61d6be291182f6e7ce SHA-1: 41f731563ada077da62a8c8d1a095d99532b0377 SHA-256: 82d608f6e70d8b057e862e789dc38c3ba888b3bd193cf7d8689fabf6b9055ce8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or scam campaigns. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=android+vs+android PDF link annotation
    • https://ourcampuswindow.com/ckfinder/userfiles/files/xokubanubasubuxazig.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/68869665363.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/69824104369.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/zupobapipofixosudelo.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/30567353994.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/jijugafidaladizoj.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/75302882307.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/zizekatezu.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/gizaviguki.pdfIn PDF document text
    • https://coevent.ru/upload/files/zegovupaxukime.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613896e2cb492---gulusekexejibanilixokosud.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/tibogexaxapopanopob.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/nudovepuw.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/65671678572.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136222a605a3---sijakinekenuzusamozus.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/xomemagewojefumugu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/tejajolujukuvafijowoman.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/sobokidutuxozi.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/moxaxojasiborug.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/matejig.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/26324735410.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/zisom.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bff849751---bapijawibigojog.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/tamixoleriwulafidaguwe.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/23207909673.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_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 17296 bytes
SHA-256: 29d4d4de32c83453cc2c7397e6a9cfa1f2d9f3d9ed80017a4dd3599204e13d3b
font_02_sfnt_off0001327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 10012 bytes
SHA-256: e80ee5a46387e2df77648a3406189db95e5e3910210d25bfb41f5b0685640218

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