Malicious PDF — malware analysis report

Static analysis result for SHA-256 6303a8d56baa012a…

MALICIOUS

PDF

68.5 KB Created: 2021-09-09 00:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61d7cc589fbff86b39e66131120bda73 SHA-1: c5b4cddb450e383e44fad87129a82e6e079c8173 SHA-256: 6303a8d56baa012aaf41b15dac9928f184aeb7e2a2e1aee022111b200a6b65fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://group-anons.ru/userfiles/files/67815486242.pdf In PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/93332863867.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/34366753261.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/30077484196.pdfIn PDF document text
    • https://digireg.dk/upload/96699655687.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/63164130334.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/movawanuse.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097442fd72---zagitagopafufumowije.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/27499198593.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/84681653717.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/24366897965.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/lufenuxiwaxadavofatida.pdfIn PDF document text
    • http://metabolit.ru/files/file/85607137129.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161392c499a1b2---vuwabaforiju.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/69550757127.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/34140038142.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/pufewuvoveratikawuzadevo.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/59407959517.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/35541804129.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/74093023330.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/18913871228.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/sexedorelotumimelafa.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/88653116779.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/12172226023.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7033467b61a22c6ba4c142aabb657292/97990241803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=coc+trophy+hackPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/funutobifa.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_off0000b0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DA 10168 bytes
SHA-256: bb7bfc551b0b7f7fb42992fbaebf5352016ef4b352c10c85f820a4704147dc89
font_01_sfnt_off0000c7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CA 14612 bytes
SHA-256: 8b3c697fd56dffc02ee239e44a68e6ec9bd881f34f83b37fc2b996711ad30bf4
font_02_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1