Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1de8f9c963dee1e…

MALICIOUS

PDF

89.5 KB Created: 2021-08-10 12:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cfafee83bd4ce01dc7cab9cd71f1413a SHA-1: 1cbe40b19cee5c640af913f66ae9bf1905f09fc7 SHA-256: a1de8f9c963dee1ef60f5db3e6d2c385d552fadf65ccf17533bb0f7e6973c68a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, some of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://vildmarksjagt.dk/userfiles/file/migapimabopelovinoxem.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5608bf07---pamevasajemigikufid.pdfIn PDF document text
    • http://mamam.by/upload/File/file/33493319877.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/tefufudevotufero.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939bc024e4a---36195908765.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f1d3a59b9e69c71d9070b89a505f56c8/padigelavonitakolo.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/31981245730.pdfIn PDF document text
    • https://mimpidia.com/contents//files/zekosefukopuvizexuf.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/dazarepivuraba.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0604451671---97759507467.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/gefozuranumuto.pdfIn PDF document text
    • https://fishboat.hr/files/53554386069.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aec705fd3afe78756d982f7749b2ba98/67101573398.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/rexovege.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160788d872f1f3---xezevabamutenusosozokadum.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/cc53093f16ec5435fd93128778a6f1cf/18904565570.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/21787506501.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/ralafivaran.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090472949c3f---xejudozowitipalekox.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/mafivavonakemufukeweb.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c794f2b3c9---64119815781.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/11107646602.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e39733ebf---69531445797.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/sebozanuzilojosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=clases+para+ni%C3%B1os+cristianos+de+la+obedienciaPDF 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_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10884 bytes
SHA-256: 27bd5fb0617418ae06aafe26da5c0d9b62d7adb37393c0c7856eee23d0216b53
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 18140 bytes
SHA-256: 32865e87e2f18017eb9775d4a85c391393e8d21bb6c30bf345086058edab545b
font_02_sfnt_off00013d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1