Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44fff6de9b499d6…

MALICIOUS

PDF

87.5 KB Created: 2021-07-28 09:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 40e2ceb5f4ed50567daf73e01dc068c7 SHA-1: 6cd8e71dd6b94fbd5a4ee237a53aafef5b4a7cbf SHA-256: b44fff6de9b499d699a7926f916885db7acaf1947c63ef1cb0007f9bd0639ad0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/ditototamevopozew.pdf In PDF document text
    • http://jhferry.com/data/fckeditor/file///32439301042.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/leweximebizimozinumo.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/rikorovikekogibinopixos.pdfIn PDF document text
    • http://esistore.de/userfiles/file/56828769011.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/72187241189.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/83fbfaa3266a9f84346752b5f2806453/fogokanigatinejor.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5026c874d---49634868636.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce6c939ab---83816458032.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/636b39799819ecf4010ca19a0a4f30c3/duralod.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb940b0f0---23346329990.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a958bf9321d36b8b437f9c72eb3f7464/xakabudupukilifaw.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/88079560813.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/xepegizefonokibed.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa042203c---jidosuzosagamebavabe.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d46d82540338617ff93858016c58f97a/befokuxenozugogugekebova.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/kuginililelegokupawana.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff95b4ce94---lozememoribifobevapo.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/16813808915.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tr96hmtrqbgmv1leueupkrtv01/pedorotagaxuzeladezovufe.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/94826513588.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c87e6ba8e8---zaxutapelaxowoku.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/rodewiwe.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609465bad1e8c---40919107395.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/6409183573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=is+there+a+lined+paper+template+in+wordPDF 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_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 16852 bytes
SHA-256: c12ac04d1983e6e19d3110f3d1540a2126158ca3bc0fed7a5fc8a1b5e51fe893
font_01_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 10692 bytes
SHA-256: 43033d69dc41435868fdbe312d7867ef3cfa1a8bf968521e5036fec3819e3648