Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5aa086c78085ca…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 23:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d39574c4114d846589f9f156a3350c06 SHA-1: af36e779b2113ed59264934a80fbaa693506067d SHA-256: 3f5aa086c78085ca4a5ff338f66b4f596d85b8e56c239cbef1bb304d0908bafa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent. While no scripts were explicitly extracted, the PDF structure and link farm indicate a social engineering attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 5

  • 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
  • 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://himalayakebab.irafbrothers.com/shipinc/userfiles/files/tevatamibitifafu.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb357df21---xoxugemomorileguvenu.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kexuvesugibubifeg.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144d9832aea4---sasetuziwazenewanevab.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/tezusonilovizulesezaj.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/89025391014.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fb75dd5a---80981309983.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0c1cd9684cbea083547b7d5ad094890d/92821745736.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9217e83db9aef13207b9f6c4631508e5/59531137731.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138598b27803---madawavukesimarakapube.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/forejubadosogoge.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/pevuwaraveladokuguwes.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/53929429125.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/58798660638.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/84062018407.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/36338159415.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/boseba.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/sosoxitod.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/78295674104.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/desamovazovilonuf.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/97789767374.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/5848904093.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/27686181965.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091307511480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=toca+hair+salon+3+apk+download+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 17484 bytes
SHA-256: 887a1a2a81deed7f24c28d39a53c1cdf5e8c40b0c6806802ad02defa4ef7a14c
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 10932 bytes
SHA-256: bb5c8a7e44de3226a61e75c7b94b2ed7e5fb2367b5373c6278a332a00fe95dc5