Malicious PDF — malware analysis report

Static analysis result for SHA-256 628eccaddd731a2a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 10:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32c8931cf887e793696d69b638396a4d SHA-1: 4f582dcbe82b2ac702809b6268c9a82d2f96d741 SHA-256: 628eccaddd731a2a44583e5df96f88844f3633398361dd59ca3a3aa56fad6f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users, potentially to phishing sites or malware distribution points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://circuitvietnamcambodge.com/hinhanh/file/78666301383.pdf In PDF document text
    • http://synowka.pl/galeria/file/96750059857.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/koxanipijanetariturifagab.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/fowaxame.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847fb651769---gozixukom.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/43365624829.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/61857678324.pdfIn PDF document text
    • https://btegypt.com/file/wokisorurekufejasize.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079f87b32391---fuwirejajizaleligapujipak.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/varemigalurevipidotenesel.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/7943788756.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/fe586abc08c7e28ad4940c351d1710dd/77817490478.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/19990964792.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/kibasogowufuri.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/80682773109.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/13359194197.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/eea8a98d45c14b7fe3ce4995b1fa6315/bujigituja.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077153f2b15e---27336104276.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/714e6f549b8fb577e1514e7a7b336e9d/tiwususejiburadesut.pdfIn PDF document text
    • https://nexapos.com/upload/files/kegesol.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/91355522698.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/vujeloderevimuru.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/93103102430.pdfIn PDF document text
    • http://dakmet.pl/upload/kanazuwulat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=master+the+catholic+high+school+entrance+exams+2018+pdfPDF 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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 11664 bytes
SHA-256: a5bd870723241c8baa977c24cf46bc4b3ceb4dd2647b15b0d8d73dcffa5ac17f
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 18788 bytes
SHA-256: 72b50eb80890094e21c34d38fa9d934376cf3c7ad11b961e1b429f11aa01f6c5

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