Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cc60e374d6a5d8…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 09:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 115245457aa9c4693709ddb711d5d7bb SHA-1: cd5a0e3f2deb09e5f730c784bade13fcb09a96f6 SHA-256: 05cc60e374d6a5d8f926fe4da3c46f6a449cd76606716f781496abf3936858c3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.mbk-montage.nl/ckfinder/userfiles/files/ruzonipesepovan.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ssmeegn0tsqe97tn8a38t8cmss/46501477654.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/92966819004.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/43838545277.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/92421824715.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782de762677---21737678804.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a99e9aa73---92026600755.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9433d63f---22168913478.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/23641228760.pdfIn PDF document text
    • http://hasyo.net/files/file/27736170070.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/1142639288.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pipagopabevovemarol.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/35d5a8d51e5c22cffecfc25710c3d5eb/65667477798.pdfIn PDF document text
    • https://austarpharma.com/upload/files/32441056634.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/98046351453.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/nipijafopaxobezija.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/mosuwupira.pdfPDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1afc49163e---61898393297.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/50443707166.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161128cfc0170a---xakolelaturajo.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/nugogexilaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=quiz+on+periodic+table+pdfPDF 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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 10804 bytes
SHA-256: bfb06a1bff59a2078f0bb0ed7e9d6d955a5de8f71f30d34595c325d9d26bc3da
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 17824 bytes
SHA-256: 6da543d1d82f76a8a484e2160a536525e5fd5aa6e6c23357e79c2058de45bc09
font_02_sfnt_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1