Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb956c4c3f3ba30…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 13:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a33f8235c085383cdf547c77ad4ce79 SHA-1: a6eff3611c4a26ab3045a077556e5878ed86b706 SHA-256: 9eb956c4c3f3ba30c80a5d583748ac9722900dc046efad274d753e3519bf053a
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links to external PDFs hosted on compromised or disposable domains, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of a download button lure and callback phishing pretext reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://esejsc.com/upload/files/71198999409.pdf
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/36321337859.pdf
    • http://runhouchem.com/upload/files/wesiderojisijokekakutokav.pdf
    • http://shiinamotors.com/js/upload/files/62031140493.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/f0otka593ff5ahtij9mjubvlrm/72546285696.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/zajet.pdf
    • http://citranco.com/users/files/31431502157.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f50ec6d928---24922414595.pdf
    • https://tsafar.ir/basefile/tsafarir/files/tizivo.pdf
    • http://xinge168.com/uploads/files/20210915192220_485336.pdf
    • https://bhsbeacon.com/FCKeditor/file/5278796344.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424eb914b5f---sijovawutoje.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce3e499e2---wurukumaputuzobimolugo.pdf
    • http://abwlanham.com/uploads/files/fujero.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/94194764424.pdf
    • http://hyundaidongdo3s.com/images/files/lalapozufapum.pdf
    • https://mygrind.ie/userfiles/file/turorupebetoz.pdf
    • http://qiuyutv.com/userfiles/files/20210916031419.pdf
    • http://erbaytag.com/resimler/files/48792088905.pdf
    • http://senvietsystem.com/ckeditor/upload/files/gekuxilinugedurosazimu.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210915_6E97C9C04429F810.pdf
    • https://cnc-ar.ro/files/file/marapawovofipawudodiroj.pdf
    • http://suspensionestg.mx/userfiles/file/mezegemagutifibekazap.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/63763317045.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ec2da42b0e896c08aa1c5f44d18cea3e/2568586160.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=prince+of+persia+warrior+within+full+game+download+for+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b678.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB678 16792 bytes
font_01_sfnt_off0000ce8a.bin
aefe13768611bbd66c81b98322f1618e4b72dcf318a391871ec4f49ba38c68c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 16368 bytes
font_02_sfnt_off0000f832.bin
a1f803286928210459a3025452a9f7a089dd97138688ed7a8b56f38a53ef1e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 11252 bytes