Malicious PDF — malware analysis report

Static analysis result for SHA-256 e567947820bd1844…

MALICIOUS

PDF

87.8 KB Created: 2021-08-07 09:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2fdc928ddd61ca5d6acf3d9e53c4adf SHA-1: 6f4f167f2df32ce4aeb56fe375ac837ab4e2f2fc SHA-256: e567947820bd184414b9854551dfe3056f6707b5b0ac0817de4dd88816cc0238
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=how+to+change+the+ink+on+a+canon+mg3600+printer PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86fcc63327---73155575510.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/gixegadanepebavem.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/2203428960.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/55208463776.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/kafivopipejikig.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf4ae32a4---36786636158.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/rabujufopa.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f50a3c1983a6a0f0f48159ef309ad675/xirobupibake.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/gajodo.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/fojezetadizixetedebebitu.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/32317804560.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/44516716411.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/23314286228.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a43441d488d2e675771333fe4e419d06/88743326377.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f904d9f66c---63920479431.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/xigixovirotota.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/92797610663.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/36613652881.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/jidelapetazu.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pewubiziku.pdfIn PDF document text
    • http://machin.kr/userData/board/file/28540895167.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5f29005f---kobudijitozam.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/4911699614.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/4632808573.pdfIn PDF document text
    • https://bnovum.hu/downloads/94277014342.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_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 16560 bytes
SHA-256: 5da3a54436b712f3f3329963c3a0336b0863dbaac39f7e24d2f6e1976908c61c
font_02_sfnt_off000135d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 11240 bytes
SHA-256: f9f180a38694875672d9d9e6942bd18d30f9e56bcab3821ec90c41f47f6a6fc8