Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bbb7ba143d8126…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 20:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8d555ebfa5808eca8cf627fdf09c2ea SHA-1: 6e3cf8eb73f3ab2d01dbcba88a5136c3a2124a4e SHA-256: 59bbb7ba143d812699adfda427a657ae8602423e3a9d811de60ea6442052b9ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to numerous domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=how+to+transfer+files+to+new+android+phone PDF link annotation
    • https://hamzsabegi60szallo.hu/UserFiles/File/34557783247.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/rusikerukisuketuzi.pdfIn PDF document text
    • http://telektrans.hu/editor_up/bobidizugowimenojitopu.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pomeradotabixizinokudep.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109090049325568.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/9453289933.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7d530d0a603d02bba366f998276ff7d7/vaposi.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/sopafitebefazunum.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/71786708726.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/69151989506.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/fuvezalomekajumapimo.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/60536211126.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/90355775046.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/sisuduvejomefipogewovo.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109120744597421.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/33177798914.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n5o14o9d4ntjujpe70kl4p3ov7/9678135563.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/62653186833.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131d21685e47---letikuzodowa.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/jowafamikukitexudu.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/dabizalebofog.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/xobuzugen.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rh23tr183omvr68i6ga6rj1qi7/39001127648.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 10672 bytes
SHA-256: e7c4484021d3bbeced6c593d02913ef66d4ce7d492a7acf3d90942536d5bbbe5
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 17152 bytes
SHA-256: fe22787f222a807da599c4312591452c3e92eb990d9d226ca57fb026292996cc