Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9afe3d8c4285a5…

MALICIOUS

PDF

94.3 KB Created: 2021-08-30 16:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aac77c6a0e146b3f6948e56e6522a3ea SHA-1: 22a8fa5e848bd8158635c40e32a865c4851b9997 SHA-256: 2c9afe3d8c4285a5a55b0d7a0c464196da94a1661a6bbb08372823e2d9dbed9e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://inprovitcaribe.com/ckfinder/userfiles/files/78664319053.pdf In PDF document text
    • http://blessingsngo.in/userfiles/files/2627991638.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/70019912178.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/3273143775.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/23956783334.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/76890871050.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4mvi4a1vgo5is22lr9b3kaev24/81596500658.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/98510422253.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f1828f946f345744d9130f86e5b98e67/xokatemugikizibo.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/pavipenopenevobojes.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/domeninenakebaf.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9pi08kbtln30p072ppp39lu853/fagazi.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/69474520415.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/8627597411.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f142046d1d---67687635800.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8571d8a478---kurojamebaxifu.pdfIn PDF document text
    • http://kleiberit.ru/files/file/lifamawuxaten.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/47209990527.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74b61103ad---losotobobetoso.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7gab29ql8udh11p7s9632e6bf5/18254921719.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/98867242832.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/59752261802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=billings+mt+to+minot+ndPDF 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_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 18740 bytes
SHA-256: 32118441c7931a0bb0bc9e5baf99cc0a8aead0b914ce7605a7db00cdd708e54b
font_01_sfnt_off00013c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 10252 bytes
SHA-256: 4198f9ec3706604f004b2f6ab2b7703be447274013bf1ff2d969d35557da3603
font_02_sfnt_off000152de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1