Malicious PDF — malware analysis report

Static analysis result for SHA-256 8413f43e0ab630a9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 08:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79a48698ef0393474f1d752ff3e16fd7 SHA-1: d292a605ef51728176119040aac53df8260d12c2 SHA-256: 8413f43e0ab630a9a03e85d6d289d04e8967ec7099a865c83c7845feccc1401d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users. The presence of external URIs and the nature of the link farm indicate a likely phishing or malware distribution attempt, possibly delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hqpr486nh8crm9rqes8163jqg6/sufarupemu.pdf In PDF document text
    • http://mikailang.com/userfiles/file/20210905162952_242929170.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/mopokosipuvunutakibulado.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/70936161994.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/zatolopapajepemigalukor.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/dosogamazivob.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/75982364353.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/23921492340.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614067ab85f8f---8899435791.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d744d905e---wojeginozofupopuf.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/11018272868.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/53c57b00f58a698f5d938ed26a87eead/80779138.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/jifusofigakaxofuv.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/4724905276.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/9464980947.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/9475926817.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/wiwigogegoxol.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/dikanigurijiwuloxosu.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/78008024706.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87f255b64---lafegepedemowewunanesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=iphone+12+pro+max+theme+download+for+androidPDF link annotation
    • 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_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 10908 bytes
SHA-256: 23ccbdf9e87a015751ba770bb50287e8ae0260c0216868b2918ef92f55b6c25c
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 21308 bytes
SHA-256: 00450fc643a20a6312429b7038a4006b4fc83c12af41b848732564137445cdcd
font_02_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1