Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6086f01bc177cd7…

MALICIOUS

PDF

93.5 KB Created: 2021-08-15 00:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 529afab7826cd1a22764c2c8a9ca301b SHA-1: 2056cd9a79a88e6031cf08f6ce1a918ae7701c12 SHA-256: c6086f01bc177cd787c2b7d23a17f62ed3695019a70b90cee8405e7def105954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://infrive.ru/uplcv?utm_term=exerc%C3%ADcio+sobre+adjunto+adnominal+7o+ano+com+gabarito PDF link annotation
    • https://www.bosingels.nl/ckfinder/userfiles/files/40748142735.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hcqrm6euemkfvs287prspg7e70/gawuw.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/1a7eb0fe5c6b86b3a605cc1ed6aeca70/warogojepazazejuwo.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/39410402668.pdfIn PDF document text
    • https://nomortiga.com/contents//files/19924613511.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ee8d72c3---soloruwuzivedesuxoxowo.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/refunu.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/34452582819.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/zebidimaratekenirojupisal.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/66556189728.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/zakawojax.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/023c4691176451017c9e76da5ef7aed0/seviledojexekarimojizaxe.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kusuzagokedezi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/afcc19124673b3a166027f24f29c64d0/34987557316.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24d8dd4fa---ratuxuxeborinegikixi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbde82ab9e8---jetovaj.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/13456870212.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/xalowozexasixegitakulero.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072811433544.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/80726800207.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04af18903---18258000166.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762f6805792---puluzugazixodu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754a1814558---bodizenuxikimanevabafa.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_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 11280 bytes
SHA-256: 2313135d8f5156688defbbf0b25f3b17eb55a52cbe90dd832300c29769b35d43
font_02_sfnt_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 19208 bytes
SHA-256: d63fe068098609f039843fb2b4b042e7531e6510741402296081b2a9b552cdfb

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