Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2683e2b84e7a5d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 23:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7fe3ade625252c810f807fb4a47cfbe SHA-1: e7431510f564f7e8a91b856df51a1a89558b2550 SHA-256: bf2683e2b84e7a5dc2d90c85a27daefaf22fa23ddc10103867c3069fc2069c8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://beiwendq.com/userfiles/file/34949981468.pdf In PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ce45ff364af1faf10f5d5ade59e8ca6e/bamala.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/679798160.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/bawunaxo.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/79306338926.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/271f7311514e9505d55d873a5a5ff810/9151479411.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8f08b7bd0dbda7dfd423da4f3262c4c/22497335835.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/v4l1daa2lr5em6dc76ov1c6e2m/nelutula.pdfIn PDF document text
    • http://dentherapia.hu/files/file/sunekuw.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/kazadoromat.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6089ea3a2e---85894372251.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/31867250454.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/semobakidovolumolejaxabal.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a1cf80f632029364a3e989a9883c71d3/94593379628.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/905b72cf4a8d97d22978f8572cc2c9cb/jududupabovozubafutuku.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/puxusuzapenewexes.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16108bb82cc152---zuxivudadeserifuxajitop.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/57378658345.pdfIn PDF document text
    • https://vleek.com/uploads/files/topaguputanezaj.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/46496756829.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/65285514238.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5df3a13339244b1cd0e37a1e431be479/makelosamanarifaruwozo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f059edcbbcd---xoninokonomogaduwemaz.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bf87be1f---9069936843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lspdfr+sheriff+elsPDF 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_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 10068 bytes
SHA-256: 51f558ff41937f7f56743df62553698da2fc8412663bffa68bb753ce8ae7048f
font_01_sfnt_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 18436 bytes
SHA-256: b33d2d0e123cbafee80a44e03d72e6692d88f2fd8fdd7ac1eef576a1a6554ca0
font_02_sfnt_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1