Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfec826e73a8ccb8…

MALICIOUS

PDF

84.6 KB Created: 2021-08-09 23:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6026d0e7b8a8a49b69b3ee701df63ccd SHA-1: 2dc376ebb5a744e9103a5e85878a9bb3258c4e20 SHA-256: bfec826e73a8ccb855d49c003c670c72aebbfbec406d59fc96bea9232c136bc6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous links, many with 'utm_term' parameters, indicates a coordinated effort to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8668

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf36c747f---67816487379.pdf In PDF document text
    • https://rewaqousha.net/userfiles/files/punivomiviniruz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0095a7a05a---28832918748.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6480e6d8400837b1aad9182a8cd07489/nozaxufeboteru.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/juraze.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/k8huga6qt71qhf4fdf6mpo6u78/96877161203.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/13895167568.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5671476181.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1f2e023489fddb136d3a3e0e9971e612/49315532547.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/64910298221.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/3p8fbvgdf755ik6ks89b3lmq88/58145439283.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94cac8c829---widamupadibi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf5fd66ea---88812205.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/25734965976.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/11c9a965af119179f3f4946b27f158a0/tipenedikamagukulobizax.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/39739292571.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tudugu.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vorazenof.pdfIn PDF document text
    • https://parfumzone.ro/files/file/mivemubimibusosiperov.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/wojik.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/32363679849.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-10/20210710170041804874.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/66997974703.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/70231028407.pdfIn PDF document text
    • http://irollee.com/userfiles/file/tumavonenuditapoxurefof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=toomics+free+vip+membership+hack+apkPDF link annotation
    • 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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 10756 bytes
SHA-256: d7e4ab9e57e8bf874812ff04b003f049a80b3d35d2b7e2c122bcefd675c08887
font_01_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 16764 bytes
SHA-256: cdb334e9265c3841f64ed1eecc392d7082295afe6702e978265fea99ca012c7f

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