Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a33b2fae548ace…

MALICIOUS

PDF

86.9 KB Created: 2021-09-24 10:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31b86cbd98171ce3b22799f516783e20 SHA-1: 47ff9b582f1079b87f9b9f719525b06aa56124a9 SHA-256: a7a33b2fae548acebf028406d748069ccfe60ff39ac1cb12e2bfd70e6d3d1412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/19dnt4lunanqpfhi4amsvrjas2/76111975481.pdf In PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/69449244763.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/maberawarojojijewusagu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fokogisuriralexopun.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/67b03006635a3e977786544f0583eb6d/wovoxepilenesufit.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bde528e22e---nutidibodelovasod.pdfIn PDF document text
    • http://18554080.com/userfiles/file/jamotanudolovup.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/08b245a30ef8bddb27e0cb44ecbcb439/zozosonikunafejebojofiju.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9ad601b7240bcb746d6fad652e684ca7/diguko.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/26263389363.pdfIn PDF document text
    • http://wmsone.com/eimages/file/26658850557.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/dukususuv.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/56357238974.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/94570659997.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/26510609124.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/98426993028.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/24971881244.pdfIn PDF document text
    • https://ratodua.com/contents/files/dufop.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/vavajitoxixurukiwureduj.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/nalukagemogelamuwoj.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/sesagoxibavituwel.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/fokazorerinewuwiwu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161496c02569b4---deronuguti.pdfIn PDF document text
    • https://windscrm.net/files/file/repowizoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=riesgo+en+el+aire+pelicula+completa+espa%C3%B1ol+latino+nicolas+cagePDF 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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 11068 bytes
SHA-256: b3924a69d1cabeb44529b18329c3e2cd2d52b0c7ab43d41d8da6c73e616473b0
font_01_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 19384 bytes
SHA-256: b06b70ae1c24e4af61c9883ea5e253d6d1b032357464d73933e41e10c0374bb5
font_02_sfnt_off00013250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1