Malicious PDF — malware analysis report

Static analysis result for SHA-256 7709bd780d4cb710…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 13:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66e6931044965252fdfcc4fc3d0ae4a1 SHA-1: fd51b7a4afb4d15efd71accb4ad6add299254ea7 SHA-256: 7709bd780d4cb7102d9a0a030cdadf59803f8c19d9b18f75125595676a78a2cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, pointing to various external domains, some of which are hosted on compromised CMS upload storage. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://burningspearmarketplace.com/js/ckfinder/userfiles/files/batuj.pdf In PDF document text
    • https://gsm.company/ckfinder/userfiles/files/repigutufosuteforazur.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630803847.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/vixep.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/pilokaxu.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/44816869226.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477cef5f359---23576980535.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbbeb9fb5---75424530840.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/jawijosuworojaposof.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/vuzovu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614895d9c19de---76708651451.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/84251633413.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/67195104722.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/sadunurolumit.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/4453289550.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/16834722879.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/gisexesapifuboxojimewiw.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/xawenosuzo.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/witidipuzisulu.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/39165332860.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/62814271162.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/sidaguwasimasularapuv.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/burebuzop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=classic+movies+free+onlinePDF 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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 16292 bytes
SHA-256: d0a7f08879eeb4ecdb28925d329072b4dbf89a334afb1a484253a0a9fed5c894
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 10496 bytes
SHA-256: b8d7e640afeca2298ec6b20941f6d63467eeb44b89406afb9e0baacc50ad0144
font_02_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.