Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffac8eeafaa6fb69…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 14:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6b5fb0ca27c3ade8cb650f292958513 SHA-1: f02f0d90627379b6b934771dfe328644484d794d SHA-256: ffac8eeafaa6fb691d69c857824fc0942bf6dcd94e1f3a0450804381d224fed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous compromised WordPress upload directories and disposable hosting sites, likely to distribute further malicious content or conduct phishing attacks. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff42a55fc---kubizunadebijivu.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/38e8c4nu479sv9d538aqlmhi62/fujumunopaduf.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985f48177c4---lijunefasuj.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/93102584548.pdfIn PDF document text
    • https://lazerom.pro/media/file/wosebale.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5a9eff9c05c912401539d5a8faafd8c6/polofurebikozugoli.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/jinaxuse.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vevudinejepudutololemav.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/79eco6uklbs9n95gk5tt9p08m3/37712658966.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lcsthnopivo98s5nefij5icerq/jetinawo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vewufezovog.pdfIn PDF document text
    • https://masihpt2.com/contents//files/3516260336.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/88239576708.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac027b6e0---37987580738.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/54192037546.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da539c9303f---77348981984.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c941219a367c3c9db86630ef6f82ebbf/61969174051.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/gidonetexo.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/sovukavonimilitigu.pdfIn PDF document text
    • http://jarosi.hu/files/file/xalulaxav.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793bf08fc04---86016966149.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e6ed59daa1e978b9fdc83010ec342227/44930194267.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811e840bb47.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/fenulumifibak.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a9398d0ec504ef6f5417751a98f96a30/92953278177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dhoom+2+watch+online+freePDF 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_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 10640 bytes
SHA-256: 9dc7c3acd43ec675fc388ee9e741c77c3e986ab460932351ad9759d5c96b87ab
font_02_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 18556 bytes
SHA-256: 76a529db7b97d5d99f9cb2dfcd3eb0b80d1af347fb7f7ad0c447312623de50e3