Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19d1d3254dbacd8…

MALICIOUS

PDF

90.2 KB Created: 2021-08-11 20:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c21bc3d959a732073807e1b3bfeee17 SHA-1: 1549e453094a29f687cc37b89a70222110dadfcf SHA-256: b19d1d3254dbacd8b64dc07494b0321749ad3040d09743f26048f799781f2488
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of multiple PDF links suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://drafthe.ru/uplcv?utm_term=is+goat+farming+a+profitable+business PDF link annotation
    • https://topjobsnepal.com/ckfinder/userfiles/files/56024469270.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/40635950953.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8d2d63e86678b5de8b90de5deb5f8763/repadefulor.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/kagoviw.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/51819338553.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/48389391168.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3afd9795---18926124028.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/menupafoxorijakewosid.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6468780265.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sigesobizi.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0bba03d1dd9d5aec8bf598db00d7e88f/19723212926.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/27714339348.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb15001030---vafufunikabenajemu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dee5cbcad61---kokuvuvito.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/fururivapegonoxewim.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e2361460770c90953cca1291009b6745/zivujagumipakinuxapa.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fb60a7cb8d2---pemizikajepopu.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/nitabe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab642ea53a9---24483213985.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/2299689692.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/mudiwokej.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3afa4943---gulolabakuwinuvuwetoru.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/vowovitagalupafepuk.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/48662284351.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05bdfc62b5---nuremugegipix.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23e851af7---gixobowal.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_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 10892 bytes
SHA-256: bb884d5a85fa739aee4817665ec3771e6f6be84b78142b6a261fa924761d15d5
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 16476 bytes
SHA-256: e0af9aef8778b3cc0b9e21e35697d3cb4c8adfadd0f8552ef4986b24aeb99353

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