Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8c11cd7f9176e9…

MALICIOUS

PDF

122.4 KB Created: 2021-06-30 08:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b8a6e10e3997a7a2f016afef5f06bd4d SHA-1: 2b5687b398a690da34eae2ec9e936cae4d680a99 SHA-256: ae8c11cd7f9176e983e651d139df8aa2a931da4ab83428585c1f1eeaae73cad8
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=self+exclude+from+online+gambling PDF link annotation
    • http://simonide.org/userfiles/file/gimoligusojesiwudil.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/01fb3a56d29219a2b970cd39b1f760a2/36760461941.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/fe017b5a786ade49a259e89fc727634d/73707888404.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/huffnsur2r6msfgp7e4jd8i9kb/dixopipasiwurejoj.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa9aba196---5563148558.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160918f4a92698---valedeliselopujadivimegos.pdfIn PDF document text
    • http://nprofit.hk/userfiles/visegaxisabekujepe.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/sogopivolofawujimexojefa.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774fa88bb53---gedozusodojudo.pdfIn PDF document text
    • http://sdds.be/userfiles/file/leguna.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd14dd2b1---80377574765.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/pufonidodafow.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/80b17256ad80c5861880ea9ba9f73465/lamufumifosabedosipepur.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tolusijojowekaw.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/jssdc8sqp7ee5l5kjbudirh5bn/lumurixo.pdfIn PDF document text
    • http://ghemassagenhatban.vn/Images_upload/files/9167394232.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ba305e284d02e9388cbdd48d163f1a75/rajotuzeje.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079e35344528---85086698745.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609285e5c4435---vutagimi.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/17918168313.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/nagodufonigumolazoxit.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000178fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178FC 19496 bytes
SHA-256: 93808544b47b04b14abedb58a590ebfa1b19925f9c3df60d32aef3053aa29541
font_01_sfnt_off0001a98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A98F 10972 bytes
SHA-256: fa0889243fafbcd39ef35ab62f3ca2df2aad90f08e11f4d79cb6b6d01c465246
font_02_sfnt_off0001c2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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