Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a4c8f11775e74e…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 17:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed7d15d6121665e9656530e654328292 SHA-1: 06738ec45889c66cd43efd67e2d20ca091d6fb1c SHA-256: 23a4c8f11775e74e36de8de8fa1944614e42d3ea9d0b2b899241752879208d5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://wastran.ru/uplcv?utm_term=escribir+una+carta+formal+pdf PDF link annotation
    • http://omonetach.pl/foto/ilustracje/file/sagaxerilatoruzumibenem.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/16818763135.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/14227962160.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/97023121941.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16211990622769.pdfIn PDF document text
    • http://health-bridge.in/upload/file/minagemit.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/60184964637.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3ed1c79a---jefasoj.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c1a273165bd0d02b8af2e0d380daae06/nivofevutew.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/24364207558.pdfIn PDF document text
    • http://www.celso.org/download/buwinuxatu.pdfIn PDF document text
    • https://rintrans.com/files/nupuworejivukipesupeduri.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/78696807483.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e5895549166e0f2eafb586c6cb5006a8/95723018284.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/natokufin.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xazibedi.pdfIn PDF document text
    • http://getem.eu/files/file/58222522989.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db5f9f6d34a---tomezelanu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9e837a72a---vatov.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609491d14c1ea---milubexikarigilukuwo.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/01/44953803752.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b323a8b52---selodoxuxemowubabej.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/adace8827469cb612d98fc7594db2cd6/mikemelatixulurifalixada.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0bf9fbbd687f72981b93fb1aa686d03c/pazuribakumuwu.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/15468478869.pdfIn PDF document text
    • http://recviem.ru/img/upload/wepira.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/bituzimimegizokuxes.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_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 19528 bytes
SHA-256: 2b86ee0df4ba6542b45c6a87d4f98279bdf48ec15fac7efb021f2c38fba68e42
font_01_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 10872 bytes
SHA-256: ce4a82d3b6aa4a7bcc4338775ef99629917ede64ba57f11a4d5b736588efb476
font_02_sfnt_off00013eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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