Malicious PDF — malware analysis report

Static analysis result for SHA-256 260df4e7952e5d17…

MALICIOUS

PDF

89.0 KB Created: 2021-09-03 13:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2177e4bc98642adbf0e0d907d6deb31 SHA-1: 73bca918b376b9202483989119141b4650a7e7b9 SHA-256: 260df4e7952e5d170ec0a1a4452cff327cad54a2deefa623ae36b1f5e9dc6da0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, specifically utilizing WordPress upload storage and form builder plugins. The presence of these links suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=adeept+ultimate+starter+learning+kit+for+arduino+pdf PDF link annotation
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b05237ff3---59394520756.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612143db7a633---94585707273.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/360kjeq6ib5ntg0j0mikkuk2ks/tipoxavebemisubosebef.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd622ef42---tigimowolono.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/purarilodusebadip.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876f04188a0---xapubujidita.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f04518ae3---84024771881.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/99089245825.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/jijoxunawirefuj.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/nabiredazereg.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/74815264016.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/rinimelafobogerakusa.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160764abbdc082---vejojugubefiton.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/kaborataxofuki.pdfIn PDF document text
    • https://kultmotor.hu/images/files/26616678650.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/suwugukutemapuk.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e409c6108c48455b272fe2006a52abb4/gejakanubewus.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gucmaqa55g1n0s1vfsm41c8823/bibabigotuvufefawofapemut.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607835d6cd4d0---64103992082.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/53368330432.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc85cc01e---21437717896.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ktb0k402hn5152p7l6jcuibfv4/43637138639.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/puzefuda.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/vorukasixowejotasadipapul.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_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 11012 bytes
SHA-256: 3696670aa0e99c142e987575fd2364e67507dc6dc0a45dc19a881b4c0f7cbaac
font_01_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 19204 bytes
SHA-256: 559cb6c6448154c324a1a7b6e408f8f0bd5cab6527a45af27d7598373ac7c0a8
font_02_sfnt_off00013da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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