Malicious PDF — malware analysis report

Static analysis result for SHA-256 f611f5d89098a2ac…

MALICIOUS

PDF

84.1 KB Created: 2021-08-24 23:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd6f20808df918ffbd281a1a2f6c33e5 SHA-1: 57e4b65339aa86b5d912f773f3a71234a6694488 SHA-256: f611f5d89098a2acb528ff9f0f95743faaf59049107a4aeb74e6f53fb8f79951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on compromised CMS upload directories suggests an attempt to leverage legitimate but compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ec10e28f---60111605840.pdf In PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/46899334101.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/22d91e5812ebb89fa0b1c3523e6f86fb/bokoxiger.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8e104484f5f9b62c3df1fccc5e9b6bea/58519776062.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/22937955954.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/vipatefaxekuzefuzaza.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/9573795419.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/gajijijazobozuv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edec7982fdf---ruxomaxoxazobuzumelise.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/dalefitadaxogit.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/nojg7j0gs84ocfcl4dg2kfbvnc/46708170839.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abad3bcc1---816336389.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210818202913.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/6d3e75b7d3332979dc336b0359576c43/92519757342.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e85ea7c1761---fanupo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5ee17ccef---jemedejaroburobazim.pdfIn PDF document text
    • https://wecareprogram.org/images/file/fifiberijafomejorifuluw.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160beb61e0fcb3---63302946499.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c55b4de0159ce13221356557dc9151d0/pudabef.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/95740739167.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609357a2e5fcb---kovolefiza.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/41663452849.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/dedotifiruzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+can+i+lose+4+inches+off+my+waistPDF 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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 17884 bytes
SHA-256: 6a6c3456b1909bb2b65a26c1b66b9d58664fbd9673e7748fe0d6cbb761bb622c
font_01_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 10772 bytes
SHA-256: e44d7d2fc39ebb84df2e347f1804891d2a6f9ea9dd0d17fcbef23781ed7c9aba