Malicious PDF — malware analysis report

Static analysis result for SHA-256 511c04aba0cafea8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 11:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cf408e0288c69b81387eb05bd343478 SHA-1: 46b91072b38acb4264e8b47818723161ddebfb11 SHA-256: 511c04aba0cafea8a6080b4694668c096040f657a85be48a43f14b1f11f9339c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/15218888127.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/699884c6c88a9a55e8da0198d165aa8d/54567625287.pdf
    • https://aartipalette.com/userfiles/file/vegadatajiru.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b5b2948ed---60767519879.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/32268a0082b7e284d92352e539336b9a/2338569494.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111c08672d51---59985361404.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a94336eeccd91e7a2667381abea59206/6933526141.pdf
    • http://detaycopymatbaa.com/userfiles/file/loforukuf.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/859ceb93b063b04e2a5720ebbac96ad7/palotugalojatexuro.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/57318275659.pdf
    • http://barcabianca.eu/upload/file/giridefawuger.pdf
    • http://targdenunti.ro/userfiles/file/lidofizutenezuj.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/qjosgf7jvtt9f9g5fuaj7ek7f6/24192437198.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0b9ebfb3---jejavuvepupoletobikib.pdf
    • http://nanoscopy.ru/uploads/files/20807682266.pdf
    • https://arerp.kr/data/file///faferixikurik.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gngn0i69fq08hsqtv4pqfn8sse/40632791542.pdf
    • http://twilaw.com/files/files/fosurevugegime.pdf
    • https://muahohangnhat.com/app/webroot/uploads/files/visamosubo.pdf
    • http://df-2.de/images/daten/file/5357305201.pdf
    • https://penal-garazh.ru/files/30588755340.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a279c290acd---gigadukexolil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hybridization+examples+chemistry+pdf
    • 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_off0000bc27.bin
2a82c1d9ba926b0337b1f462f0923d74775b6dc49220cf86c93a68f52ef355ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC27 11292 bytes
font_01_sfnt_off0000d643.bin
6e4cb49c1df80ab1ef27e702ea2e50275a2f9feb2816b852d5eebfbb01c58c36
pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 17220 bytes
font_02_sfnt_off000102a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16792 bytes