Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f774deb4f67d89…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 10:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 756361a6fd1658e0197fb09112c55d69 SHA-1: 7a3cca34da0e36149d5c424b1b253d33a9b4d325 SHA-256: 35f774deb4f67d893f09d31aad317d0910f13c7a050a29fa6032f0a0ecb68bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f723eb47---tomotiwobizimigef.pdf In PDF document text
    • https://htijsr.com/userfiles/file/xuwuzazo.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/badilujidozirepotojame.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/60894357837.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a94ce30691---8288576026.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160707b053f873---derujekixorerowobakexozi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5146c052c21427e1289c1f8f61ee3efb/povefobir.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/96184327179.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210827142938.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7d86cfb5---mozusewiti.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/13dcc4166a3d7955f7dbfff157c31b4f/18679390016.pdfIn PDF document text
    • http://yepuco.com/uploads/files/94812348236.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae9c01131---67381857926.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2377aa3172---8403213462.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/87101522937.pdfIn PDF document text
    • https://protrialse.eu/files/files/87314033314.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec786c2144---gitibepetus.pdfIn PDF document text
    • https://davaocarrental.com/images/file/233465784.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/9f17chlfsl7ueods4eesa5g0q6/82183426412.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/96559212869.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xobilironura.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/xubazutomigu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a8d944d3877f03ce9e046c2aee5a13a2/katererabizumetosimot.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/todewimofufexaxotuvuw.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/5372241484.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/13653840064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=national+spelling+bee+words+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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 10876 bytes
SHA-256: c1c344c0e445231e686158f06d21ff92099ad27080bdf0dd933a8d96a60b0680
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 18352 bytes
SHA-256: 56fad3d2246a124665800efd754b7678028ae07dc5809e77e61d602e8bb3773f
font_02_sfnt_off0001275d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1