Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2cbb5dd1ba2d73…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 19:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 13e29496e36ca67881a8a30d4d02c853 SHA-1: fcabbfda33d29f124cf308c1a387093bd780a598 SHA-256: 9c2cbb5dd1ba2d7357e32b8f036582e567f70cd04071e14fcd76f2db42964687
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. Several heuristics indicate the document is part of a link farm, pointing to external PDF files hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://escuelasfutbol8.com/docs/files/tejojadobevur.pdf In PDF document text
    • http://lorichphoto.com/pictures/file/vekurufiposi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608996cfef92d---lerozakitijaxot.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/14589332161.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33756321846.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16072c48a358a2---7910497856.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/vanovuvejefujalerove.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/72650020251.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/32522942754.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/82002960710.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210808_9BE7D815FC1B8664.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/pexarevefenalifos.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/29538655008.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210724024350.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/7692101864.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/bububusorere.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b309b2ba9d41dc159f9a0777beab75b9/xujibosuxozogimuxegutonud.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160815edbe0a4f---23013073071.pdfIn PDF document text
    • http://spakimthi.com/upload/files/77047073488.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/fitilofipemuledove.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/13998357461.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/gelumejinigujanotut.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/rojixaxirifokomokid.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/63445767971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=javascript+tutorial+pdf+githubPDF 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_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 10960 bytes
SHA-256: 22add4e3d52cfc56ef21d7ef1979ec6cca30534cf8918886314bb5dda200709c
font_01_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 17816 bytes
SHA-256: 78a570161b20a760d1a794f701ba31e6ea48d20b92c194ea658d91161e9440f2
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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