Malicious PDF — malware analysis report

Static analysis result for SHA-256 2144e43116f0ff73…

MALICIOUS

PDF

71.6 KB Created: 2021-06-25 19:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28519c184152266b108373ca7b93ed4c SHA-1: 58ee15771adb961752ad87fa91003563b059967c SHA-256: 2144e43116f0ff73e37313a81f84acb081b35eba2a2e2e726f6a8a934c4818a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The embedded URLs and the PDF structure strongly suggest this file is part of a larger attack chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7380

Heuristics 5

  • 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
  • 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.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f94b8164a---27646844359.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a4884d8e25e3961eb6637b6e5e4454bc/kuserafolesito.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb791edfa---25627838009.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/78cf8a235e9207daf0d3822cf83dab9f/fowalorilapekoxor.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/48746075431.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/neworubevenamusuta.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160942aaa5ff19---77131160499.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/53829497059.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/87ln7lcpgmkoukqt4bhrboail5/50460946576.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/lirumaba.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb3a6a998---31493648391.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/favurudazemakedijobatowa.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/i59cclm1kvkbensgnpaq5hlv8h/67030162370.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/327242eeffe11578f8817ed6695f9e8d/52685475598.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3083dc67300c7e6a47e0dd4e6f024f86/46367072142.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/44404213367.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/minusuribak.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/nimumorozo.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/piginun.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xotimoginotesozitodexopa.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/77149994394.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d376d83b2a---69447073993.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/52ef76d3b66e3466349908d76683fe2e/fovafunalanadivopudo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fivelodobebitixesaxapiwom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+megalodon+online+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 18320 bytes
SHA-256: 29a573e27a51be23f942d223485e19d59f019b9252edc0c378668995579be6b1