Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebea720a928e2b68…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 19:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8340a5b37bbaa41ea940111f8d5b7c40 SHA-1: b26ca460b1c16070d4bee9b9e323dce5433dd628 SHA-256: ebea720a928e2b68f5964b94058819a9a4a50d89c9d3d873fea82bf2d906079f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=physiology+of+spinal+cord PDF link annotation
    • https://deltagroup.bg/uploads/file/kezumatijavupisara.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/jelidiper.pdfIn PDF document text
    • https://deepex.hu/hirek/files/razipegebiwanomusubom.pdfIn PDF document text
    • https://aokman-drive.com/d/files/93114062803.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/81088217347.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/musosabupapozojololuvaxuj.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wikosuzek.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/79618896067.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077af4c05be3---fuxakirebudebisid.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/2859110612.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/nazapokuvobanubux.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/20558747c1521409e76757be1beb8b13/tosepi.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/wasogisosubajosizi.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/memipesuzuwog.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a69c9a2a---jidatowilezenativekoxiwav.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/93505321707.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/22978448374.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607027f814ff3---19510852993.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c007185d21884ac198ae60e5f68d949/62885246405.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/89373916869.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/75090103922.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1627402316302862071.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/sazilutigovelanuxa.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/17742350366.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/vexufadurew.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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 17344 bytes
SHA-256: 68fdc3a16d26479b5663fd9c3eb4b630fdb6e610d21cc289de0848584c15b90f
font_02_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 10784 bytes
SHA-256: bfa0d1aa43e1926b970cbe670e67900337421ec68b1923c4e51574a963ae260c