Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1632f973c1dab4…

MALICIOUS

PDF

75.6 KB Created: 2021-08-18 05:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0abefde3a02464e1a5819728cb3bffa SHA-1: e26d77ae9e670e5d6144498ddf3b0d46adf54977 SHA-256: 9c1632f973c1dab46e0a7937f27155ebf1c079f65c690f81ee85e5d563cd4efa
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a strong intent to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a5af195fb---dadetubegoxupofawaruk.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847d074fa28---vefubotabedasukafimofuji.pdfIn PDF document text
    • https://emmaushuis.org/pages/rafijixibodeleweruxi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qsgi1cnn3snteodkjlfnrk2lcq/88663683079.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/wominuvedowakomagigosir.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/2d10f0a241856e21359705ae19d7acaa/13095500348.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ec1dc305---15060836927.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d689c6105---88543221210.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/gezurodopepaxoxavi.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/leluwogewovomozib.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3cbceedf3---19372266807.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/zotusinerusalavafuw.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/saxazogakoparejuvakifidep.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/15712758393.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/85200629024.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1628165416_404ccd9409.pdfIn PDF document text
    • https://cubic.is/userfiles/file/jepovazigofe.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2162341f6---20996517401.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca866eafa2---ligabozuxudokusiw.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1dbe5977---vepitejupajabubeledeziw.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a146973e6c4---ronimu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rumotozemibofijonufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=controle+de+maths+vecteurs+secondePDF 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_off0000c3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 10740 bytes
SHA-256: 74fb091ecdd20ac8200861305826ebf6992f053e2afdaeca62d4ac735dfaab26
font_02_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 16876 bytes
SHA-256: f5c6da6c5baf19e23fefe7083960b5c07de06afdc09357348bba97016562bc89

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