Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c63d0affd3386bc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 17:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc5c9dd5e008d00550192cce02247c09 SHA-1: 6e885b8b849106ef72f9ee727d311092293eeaf2 SHA-256: 0c63d0affd3386bcf0b51f76446ef659c293dd241988c2bf78d4093f2cff2df9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators strongly suggests an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=my+hero+academia+season+4+watch+online PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gl1q5aage5nheonlbppi2gp2kj/serijinulewo.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/33323767745.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/72475030442.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gedudubuxe.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/kinojeg.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/69999709419.pdfIn PDF document text
    • https://tarsiman.ee/files/file/16720550635.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/31162427295.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1ff12a98---67989044653.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109011836325535.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e976eca6f0---79465385382.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/84563605891.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/siriwa.pdfIn PDF document text
    • http://greenglobepms.com/uploads/51996019447.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/sofizezenivuxojupulotuw.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff6cdb243c---26012825563.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b8a294026e5058022d627b184b1ddb68/pexet.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/gawefebemerabobigadafedaw.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/jozerikamokixoduraxirote.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/48948064010.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/23112664564.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/16789796558.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/15633563562.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6820efe6---9225217007.pdfIn PDF document text
    • http://bjjiffy.com/upload/51186722935.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_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 10904 bytes
SHA-256: 56de3187530c9e15a207cc02a0714dff8fbe97fe84721693db189ca93284c24a
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 17928 bytes
SHA-256: baf40246a0e6089c0076010a64c234e7db8e179f4ff38927f290c7d8b6315aff
font_02_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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