Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bed092d935f6b0…

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 05:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5bbd5f2da61da8837f4557644af0db95 SHA-1: 4b2b20c39cb85d66b072bc8998aa3ef63d8d72e7 SHA-256: 28bed092d935f6b02e42aa36b50bff987beb7d08c3d16ed64f7b58e246354bf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of multiple PDF link farm indicators suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc057ddeccb---19425295711.pdf In PDF document text
    • https://hotellemaritime.com/hotel/upload/files/38105366113.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/38911584623.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9e34381b1acdf3b666fc46c1912b3e8f/jejibo.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/91595244471.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/bidilan.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/99550538126.pdfIn PDF document text
    • http://atek-ent.com/upload/file/70991527303.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/80674089054.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/sonur.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/xelanupeta.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/getipevojeku.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/69424766187.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6750d242e130a6101a718604cacbed71/39290014812.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/12443312302.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/35980659508.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb584f48c9d---gulewevo.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/20663913366.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115aabfe9b1e---fexolunoketukuniremorani.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/997cccdde7d57868a5bca871acd2deb8/xafojenapal.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/95543169611.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8fe95ccc---4727080182.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/63193068823.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983bd9e4f0c---65769663898.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/favanebetofiguvibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=baixar+c%C3%B3digo+civil+comentado+2017+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_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 19204 bytes
SHA-256: 058ee50c253296552a9ac53e5d176178561ff90f4ee44426571097356c9715f6
font_01_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 11500 bytes
SHA-256: c268ba4d3325254e4017eae971c9edc932f163d67fd8751a7716502d33c0084b
font_02_sfnt_off000141b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1