Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8509b99a8fa438…

MALICIOUS

PDF

115.1 KB Created: 2021-09-06 19:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c9a3a90a69345a2a3ceb34e5eed75bd SHA-1: ccb14d5555736adf98b789346828f07581d4d422 SHA-256: 7e8509b99a8fa4388c74f0668990e2e55329aa3dc88cef26d710545e63cc1634
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be directing users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hwayinn.com/image/files/20210622_185747.pdf In PDF document text
    • https://etimes.mn/uploads/files/30381961557.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/fapizapujinexuromugupupum.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/1555140027.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/26435804835.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161114b69654ec---juleladeru.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mll7p59rag0qp8pshcf3mid38j/27838146606.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3b6020bdb---15956349187.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/82fcc5b32be74a406f129f707d7cc307/64720758697.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/jawozulima.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02e6a0ff2---74523410376.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2u6setntc7t0oadsnvrn4vkmgt/wiwukepitenewi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161239481a8cce---xuwafapa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/6d4ehtqmip9skvl0oigqe4bghr/sutaropovarixivulaxowupaf.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24323212d3---mufosek.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/zizer.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0513818aa---51284339180.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/91089660080.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/68011795414.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb629cebc---57353695147.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/wosovudixefilamen.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/41730382591.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/15753094150.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a70dd2dc---20431406556.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/19/file/20210719_145436_188.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/84934076027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=prattley+manual+weigh+cratePDF 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_off00015889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15889 10688 bytes
SHA-256: dd55674130c9c3c3ab0e1f8ae4ad00289f0ebcca05b961a24cf64c822e067674
font_01_sfnt_off000170e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E3 20560 bytes
SHA-256: a9be36364835c9756a759575ef73b6311f261fcb2ea15dae4b41d50702bd7b6a
font_02_sfnt_off0001a62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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