Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b2344b005cd4b3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 04:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aaa15d47cbe874e02abca566901a06b5 SHA-1: 690678e912876b3491582bc6ccfab219e469ec2b SHA-256: 89b2344b005cd4b3f8db26472e348254fe0a574a86cbf0820129f2e07e2a3c26
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://live-lessons.net/lcj/web/uploads/assets/file/59146422354.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8cc5c6f2---forojatu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe84d5342---nakoravitanivifowowizu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc6db9335---66323474921.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/59577646040.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210714014539546876bbjusmw8x09x.pdfIn PDF document text
    • http://usa-ex.com/kizapasebavujofuzapukitip.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/pupizewutuziwot.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb296f03547---komaneposogaguto.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/28800781092.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/83734527952.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/68370624614.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6ddee33c598cf201a1dca39a03129608/xewifunowugabapajezusadu.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/papabagirebumosevuge.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d7ea1043fe67c6db706e8608392ae46f/kogodaxaditatakob.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/17701442705.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef8f9efdc---71624865754.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/00odbomd4eh4vqtmd7elj5mbar/zopixedulivitu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b3e1e34ebbb50f1d756ff90c7ec0efa6/wuzesudafakil.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/69hb1q56ilcr4a7mjt959mn5j1/13696411198.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/dotaxomapo.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/27756090336.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mesonelejomunadu.pdfIn PDF document text
    • http://ramayafaith.net/clients/64268/File/69894130037.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753ad8b8f30---73654828979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=income+tax+worksheet+for+social+security+recipientsPDF 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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 18136 bytes
SHA-256: acccd59c82eb9e56d9b1e695464ebe21578ce2f8f7af4710ed38a36bf282d774
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 11192 bytes
SHA-256: 830130af27b0de59013e6fa66540b41cd57aa1b53e4ba2a3f6422a6289e06c90

Open this report in the interactive analyzer, or submit your own file for analysis.