Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da5793055505598…

MALICIOUS

PDF

97.1 KB Created: 2021-08-03 15:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 649961a170999bed35f38fb0430d5280 SHA-1: bbb8d95affd28ba7eb3930d49e01c2f5accde036 SHA-256: 7da57930555055983f7f0c845805e6979329df95e80c28546a2e7b2aeacd955f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f69d946b598---verurojosolezexanolik.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac34f1ed5a4---99136079769.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/sojubekakilizexawebasa.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/9f1d8a08f7fa9dcf793276e6779a910e/xedonasok.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/tbmb2uoun5qnnir501iup3cu7r/vimivexejoxepexukib.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/zevenamatasopomonadovi.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/56024469270.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/finojo.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bcff0c55d1f0bec4d7707e7dfea4e237/39195924848.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/zifofifutuxesaw.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/v9poruciru1fe7rafdqv0uok62/kesimigod.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/fikonufijerena.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160736ecbb74aa---vimebutexodaxugoveziwe.pdfIn PDF document text
    • http://cke.hk/userfiles/96342739455.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/wofigulewaw.pdfIn PDF document text
    • http://sns.hu/_user/file/zebiniloxefagikedewozi.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759597e264e---konetofezawonexajosukimi.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/verogewinoribisinepo.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/joluxaboluxabovup.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bm0pmvl5u0nhcjn0nqisrb7sg6/20144549097.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/85a3b2d18263018476383cbf214ed993/62836511129.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/nutovokukefozijofi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa75c4589a6---gurekinojexidego.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bf7f4a550---resafurekopajixob.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6f36eb0f660fe3819d4bc75172a41907/70617433433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+size+tires+does+a+2006+honda+odyssey+havePDF 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_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 10940 bytes
SHA-256: 0e2d100d07f2dedf7f958422bc78cd38ac4fbcc64456bfa210ff98a136eaadc7
font_02_sfnt_off0001456d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456D 17828 bytes
SHA-256: cfedd3c21290e231bc0b2f86ccb63eb7e9feaff6196021363909d8671dbbd466