Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c78c1fd16a702d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 22:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6696e979299e3fb41b1715469f4bd7e SHA-1: 51b41a6adbe08695d74355c6b6373ef4f5c7399b SHA-256: c9c78c1fd16a702dfc587d2576603979ee3919463b38aede26a2ffbf54011538
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=got+season+1+episode+1+online PDF link annotation
    • https://matteagianotti.ch/userfiles/files/79696976471.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/tanedifodame.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/47529645010.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/nafulidupawewija.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/dobofujijanufok.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/kusoga.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/35026485835.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/fezujotukotujebef.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/69568737170.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/20800671756.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/13843624539.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/18684344273.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/38899415230.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/pasovuronidexifo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613785ea5d8de---64556036910.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/54673596045.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161314ec852d5f---dadoredifetonawebuzus.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/fetoluj.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/filodezexarepeviripowenoj.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/15959745777.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcb9d7d96---61294441240.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/pejigewobogipaxawerawite.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f32289e8fe---puxikagoxopefawezokizajit.pdfIn PDF document text
    • 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_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 10376 bytes
SHA-256: a104af9980fde453a254e89fc05b1f76e922ac0b86e28ae38376f418c2931a06
font_01_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 16436 bytes
SHA-256: f9b15a052b8eee250445efa0cbda08fdc31a5bfe2720bb362e7f5b07f31eab03

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