Malicious PDF — malware analysis report

Static analysis result for SHA-256 18232e22f9228a06…

MALICIOUS

PDF

76.1 KB Created: 2021-07-20 07:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f63c2212df5d5a79141d13bbe5522f1 SHA-1: 7e19f61c8f9c115874a8bfd5cdf9f04d67b9a860 SHA-256: 18232e22f9228a06e4bcd251b7d4c949d0987b816068a9e3c231a2b76edbf72e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, likely for SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9c6dc868---lagonewitinejamemasubejuf.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160873fb3026b2---mevubawar.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/53da8a1ec293720d04daa4fa5de7ac07/lunexosubuxelaluxapisol.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/88365435457.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa407c4fd94---84296604023.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ada25cdd4---warowapilo.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/kifujugufinul.pdfIn PDF document text
    • http://sns.hu/_user/file/xutinozavabikibe.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/be9kjdtf4psjptd7s3gn16qndk/49414154459.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/simubaruxeziwodes.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/81172220850.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075959b5563e---39951042512.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/26/file/20210626_051352_181.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/af2be696c1e1899393d55d2a5995cc38/kekumu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24449b4dd---97906967394.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/liwogopi.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/99938218615.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/851e663d30dee1763e505841bf1cad2c/24355827738.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/rj6eaisa85qibs5tmljqf4hjil/xozisebenenijefepo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9afcdd2748---25748556245.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/gixozebosomepidisud.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/85740440617.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/39915541152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=houses+for+sale+in+bellvillePDF 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_off0000c76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76C 16804 bytes
SHA-256: e426739c94e48a304c4a0cfb36a8a8b9e39b04ec40332405b4962d1377bfb6be
font_01_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 10404 bytes
SHA-256: 4e4bba02608b0300edfc8c4e5d862e2c8daaf6ed8179f8f73c6e102262449a50