Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b61090d2a406573…

MALICIOUS

PDF

107.2 KB Created: 2021-09-19 11:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5eb46ecbe7a2da3fe6995271e1887f23 SHA-1: 0138d0921378a7291c4c9d3dfd6b894cedf6b384 SHA-256: 2b61090d2a40657364ba9742ff07c05688c57f5d3db7c2373d6dcdef4539f80e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hpworld.hu/data/pic/Image/file/rugetenutilefurebulev.pdf In PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/fagidazefudedaduduw.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/lukobasokotusatid.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/22481294779.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/72837671866.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/lirur.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9cbbf0khprvedm6llu76f03vp2/lavepilip.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/2366433360.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb64c38c9c---pekenagamiluju.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/t9jlm0ji8fovmkor40cvt6rep4/zonizesisumuberusolarejur.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/zuwodume.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/gelinafovuturozivefa.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/75628152155.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5201ba0aa3c46636814e7451b4441cd1/61692783390.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/59713473857.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/nifewijoligekidudifov.pdfIn PDF document text
    • http://wohntraumgmbh.at/rokupekinufinenotaloduv.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/10386735736.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/zefomefulof.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/2009373289.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6f490581c2352027934798349d23d246/91869186352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=elmal%C4%B1l%C4%B1+hamdi+yaz%C4%B1r+tefsir+okuPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/79939502140.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_off00013d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D63 10912 bytes
SHA-256: b90da623bb93a307189beaa0bdf731401561dd3cfedfda06a9fe3ef47a73b25f
font_01_sfnt_off00015691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15691 19444 bytes
SHA-256: 16ba0356884d31325270aabbe9ae06263f203a3c19311585f1457ceda230ca38
font_02_sfnt_off00018548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1