Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaa8d349587866b…

MALICIOUS

PDF

97.3 KB Created: 2021-08-02 00:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 23e5db25f1be44944dcde1fe9ec8e88f SHA-1: a045a62cf2645f614883810fc71872c96e8e376c SHA-256: cbaa8d349587866b068374e6117256c762fb7a30e44b240e2e00af37546a52a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users, potentially to phishing sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/69ed0759a317f507a78e8ecdb16d5956/pejubamivagitokawiw.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907a7710cb2---juximan.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e684a20cea---rodiviwuwupesivexepaxesun.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/43099045450.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/013865717d6c7d7e4c9a78d081a23739/39904803245.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/pivudadevasubajakubiboj.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/65818669569.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-24/20210624110338213308.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a17a5abac---6707736393.pdfIn PDF document text
    • http://clingac.es/d/files/saxowagebogemafilot.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eec764534c8dc3c11d53847953bae2a8/dafururijexaxiwomaj.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3d758c1a118dc8e24bc417ce284bfe30/gowelukimukazokeruwexove.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce3cbf1d6---68772412068.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a39386b0a---4587826627.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/zanisosuwemebakufamafof.pdfIn PDF document text
    • http://stylekd.ru/files/riduzulutoliwulijip.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c04cea96a88---13253770265.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/xedezebuwokigo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ocnhs60vqvqhur92noa0o0gf9/rumipodirupadazidi.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/92986915189.pdfIn PDF document text
    • http://flexa.cz/docs/file/fopivupam.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/kolomubuwoxelizil.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2683959358df80a45346ef12d98b3814/todofutiwakomig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+how+to+read+tarot+cards+bookPDF 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_off000116ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EC 17580 bytes
SHA-256: e32845ba32264b3779c6ad63cbc9098daa89b3cf3cd4d04111c854e509cb6d57
font_01_sfnt_off00014461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C78 10596 bytes
SHA-256: 01a8923d7fd6ddc19049aced8ae4268806ad28a2d43f60ebf55f573523b9f219

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